Momentum founder Jon Lansman has called for Labour rebels that vote for Boris Johnson’s Brexit deal to be deselected ahead of the next election. 

The remarks from the senior ally of Jeremy Corbyn came just hours after shadow chancellor said rebels would face “consequences” but declined to say whether MPs would lose the whip for backing the government. 

On Saturday, the House of Commons will vote on Mr Johnson’s new Brexit agreement, but the outcome hangs in the balance with undecided Labour MPs from Leave-voting areas and hardline Brexiteers on the Tory benches.

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Appearing to pile pressure on Labour’s leadership to severely punish those who back the deal, Mr Lansman, a member of the party’s governing body and chairman of the grassroots group Momentum, said the MPs should be replaced.

“[Mr] Johnson’s deal will be a wrecking ball through the live and well-being of ordinary people across Britain,” he posted on Friday. 

“Labour MPs cannot and must not vote for it. If they do, the NEC [National Executive Committee] will have no choice but to be replace them with a new, socialist Labour candidate at the next election.”

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UK news in pictures

Shape Created with Sketch.
UK news in pictures

1/50 17 October 2019

European Commission President Jean-Claude Juncker and Britain’s Prime Minister Boris Johnson shake hands during a news conference after agreeing on a Brexit deal, in Brussels

2/50 16 October 2019

A man walks his dog through the fallen leaves in Clarkes Gardens, Allerton in Liverpool

3/50 15 October 2019

Police officers carry away an activist as Extinction Rebellion protesters block a road with a caravan in central London

4/50 14 October 2019

Queen Elizabeth II sits with Prince Charles on the Sovereign’s throne ahead of delivering the Queen’s Speech at the State Opening of Parliament

5/50 13 October 2019

Great Britain’s Joe Fraser competes on Parallel Bars during the World Gymnastics Championships in Stuttgart, Germany. He claimed GB’s second gold with his victory. The 20-year-old from Birmingham nailed his routine to score 15.0 then watched as a series of rivals failed to live up to his total

6/50 12 October 2019

St Helens players celebrate with the trophy after they won the Super League Grand Final at Old Trafford in Manchester. They beat Salford Red Devils 23-6

7/50 11 October 2019

Richard Ratcliffe, husband of British-Iranian aid worker Nazanin Zaghari-Ratcliffe jailed in Tehran since 2016, holds his daughter Gabriella during a news conference in London. Their five-year-old daughter has arrived back in Britain, after making the “bittersweet” decision to bring her home

8/50 10 October 2019

Irish Prime Minister Leo Varadkar and British Prime Minister Boris Johnson at Thornton Manor. Their meeting focused on further Brexit proposals

9/50 9 October 2019

Wales survived an almighty scare against Fiji to secure quarter-final spot at the rugby world cup. Warren Gatland’s side recovered from a 10-0 deficit thanks to a hat-trick from Josh Adams

10/50 8 October 2019

Protesters dubbed the Red Rebels at Millbank at the junction with Great College Street, during an Extinction Rebellion protest in Westminster

11/50 7 October 2019

Final preparations are made in front of a reproduction of Michelangelo’s ‘The Last Judgement’, ahead of the opening of for the ‘Michelangelo: A Different View’ exhibition at Hull Minister

12/50 6 October 2019

A car drives through a flooded street in Whitley Bay in Northumberland

13/50 5 October 2019

Thousands took to the streets of Edinburgh today to march in support of a second Scottish independence referendum

14/50 4 October 2019

A 12ft sculpture of a gorilla, entitled ‘Gorilla Apocalypse’, created by Luke Kite entirely from scrap car bumpers and panels discarded in the last decade is on display at the British Ironwork Centre in Oswestry, Shropshire

15/50 3 October 2019

Police stands in front of the Treasury building during an Extinction Rebellion protest in London

16/50 2 October 2019

Ex-Thomas Cook employees demonstrate in London after delivering a petition calling for a full inquiry into Thomas Cook’s collapse and for the company’s directors to pay back their bonuses

17/50 1 October 2019

A road in Alum Rock, Birmingham is flooded after persistent heavy rain

18/50 30 September 2019

Two tourists pose for pictures in front of Union and EU flags outside the Houses of Parliament in London

19/50 29 September 2019

A sheep on London Bridge as Freemen of the City of London took up their historic entitlement to drive sheep over the bridge, which was once London’s only river crossing

20/50 28 September 2019

An Aldabra giant tortoise is fed watermelon as a treat at the Malvern Autumn Show, at the Three Counties Showground near Malvern in Worcestershire

21/50 27 September 2019

Gallery assistants pose with an artwork entitled ‘Devolved Parliament’ by British artist Banksy, during a press view in London ahead of Sotheby’s contemporary art sale, as part of the Frieze Art Fair

22/50 26 September 2019

England’s Jonathan Joseph is tackled by United State’s Marcel Brache during their group match at the Rugby World Cup in Japan. England scored seven tries on their way to winning 45-7

23/50 25 September 2019

Tributes for former Rangers player Fernando Ricksen at Ibrox Stadium. Today, the funeral procession will pass Ibrox Stadium before making the journey to Wellington Church

24/50 24 September 2019

A person dressed as a caricature of Prime Minister Boris Johnson in a prison uniform stands outside the Supreme Court after it ruled that his decision to suspend Parliament was illegal

25/50 23 September 2019

Thomas Cook aircraft are parked up at Manchester Airport on the day they collapsed after rescue talks failed. A total of 22,000 jobs – including 9,000 in UK – are to be lost following administration. More than 150,000 British holidaymakers need to be brought home, with the government and CAA hiring dozens of charter planes to fly customers home free of charge

26/50 22 September 2019

Fire performer Penella Bee performs before people take part in the North East Skinny Dip at Druridge Bay in Nothumberland, an annual event that marks the Autumn Equinox and raises money for MIND – the Mental Health Charity

27/50 21 September 2019

Protesters gather for a march and rally organised by “The People’s Vote” in Brighton, to call for politicians to give the public a final say referendum on Brexit

28/50 20 September 2019

Protesters in London joined millions across world to demand urgent action to save planet in the largest environmental protest in history

29/50 19 September 2019

Rapper Dave poses with the Mercury Prize: Albums of the Year Award at Apollo

30/50 18 September 2019

A surfer in action during sunrise at Tynemouth on the north east coast

31/50 17 September 2019

Protesters dressed as the Incredible Hulk and Robocop outside the Supreme Court in London where judges are due to consider legal challenges to Prime Minister Boris Johnson’s decision to suspend Parliament. The Supreme Court will hear appeals over three days from two separate challenges to the prorogation of Parliament brought in England and Scotland

32/50 16 September 2019

Farmer Tom Hoggard harvests pumpkins at Howe Bridge Farm in Yorkshire, ahead of Halloween

33/50 15 September 2019

Team Europe celebrate winning the Solheim Cup at Gleneagles in Auchterarder, Scotland. Europe won the last three singles matches to claim victory 14½-13½
Sunset at St Mary’s Lighthouse in Whitley Bay

35/50 13 September 2019

Activists from PETA stage a demonstration outside a venue during London Fashion Week in London, Britain

36/50 12 September 2019

Australia’s Marnus Labuschagne attempts to stop a boundary in the fifth Test

37/50 11 September 2019

Storm clouds gather over the pier just off the North East coast at South Shields

38/50 10 September 2019

The peloton rides past the Angel of the North during stage four of the Tour of Britain from Gateshead to Kendal

39/50 9 September 2019

A penny farthing cyclist rides past St. John’s, Smith Square, Westminster, London

40/50 8 September 2019

Australia celebrate the wicket of England’s Craig Overton, which meant they won the fourth test and retained the Ashes

41/50 7 September 2019

Manchester City celebrate after Caroline Weir scored during their Women’s Super League match against Manchester United at Etihad Stadium. The WSL attendance record was smashed with 31,213 people watching the first Manchester derby of Women’s Super League era – nearly six times the previous WSL record

42/50 6 September 2019

A bull bumps into a plain clothes police officer (left) while being walked by Prime Minister Boris Johnson during his visit to Darnford Farm in Banchory near Aberdeen. It coincided with the publication of Lord Bew’s review and an announcement of extra funding for Scottish farmers

43/50 5 September 2019

First Minister Nicola Sturgeon cuts the hair of David Torrance MSP raising £1000 for the charity Maggie’s Centre in Kirkcaldy at the Scottish Parliament in Edinburgh

44/50 4 September 2019

Australia’s David Warner looks dejected after being dismissed by England’s Stuart Broad during day one of the fourth Ashes Test at Old Trafford in Manchester

45/50 3 September 2019

Anti Brexit demonstrators attend a protest at Parliament Square. Lawmakers returned from their summer recess Tuesday for a pivotal day in British politics as they challenged Prime Minister Boris Johnson’s insistence that the UK leave the European Union on 31 October, even without a withdrawal agreement to cushion the economic blow

46/50 2 September 2019

Set building begins on Waterloo Place in Edinburgh ahead of filming for Fast and Furious 9

47/50 1 September 2019

Members of the Royal Southern Yacht Club and the Island Sailing Club take part during the annual cricket match between the clubs, which takes place on the Bramble Bank sandbank in the middle of the Solent at low tide
Anti-Brexit protesters demonstrate at Whitehall in London

49/50 30 August 2019

One of the iconic ‘Girl with Balloon’ artworks by anonymous street artist Banksy is carried near one of the original locations the artwork appeared at on the Southbank in London

50/50 29 August 2019

The sun rises over the sculpture “The Couple” by artist Sean Henry, at Newbiggin-by-the-sea in Northumberland

1/50 17 October 2019

European Commission President Jean-Claude Juncker and Britain’s Prime Minister Boris Johnson shake hands during a news conference after agreeing on a Brexit deal, in Brussels

2/50 16 October 2019

A man walks his dog through the fallen leaves in Clarkes Gardens, Allerton in Liverpool

3/50 15 October 2019

Police officers carry away an activist as Extinction Rebellion protesters block a road with a caravan in central London

4/50 14 October 2019

Queen Elizabeth II sits with Prince Charles on the Sovereign’s throne ahead of delivering the Queen’s Speech at the State Opening of Parliament

5/50 13 October 2019

Great Britain’s Joe Fraser competes on Parallel Bars during the World Gymnastics Championships in Stuttgart, Germany. He claimed GB’s second gold with his victory. The 20-year-old from Birmingham nailed his routine to score 15.0 then watched as a series of rivals failed to live up to his total

6/50 12 October 2019

St Helens players celebrate with the trophy after they won the Super League Grand Final at Old Trafford in Manchester. They beat Salford Red Devils 23-6

7/50 11 October 2019

Richard Ratcliffe, husband of British-Iranian aid worker Nazanin Zaghari-Ratcliffe jailed in Tehran since 2016, holds his daughter Gabriella during a news conference in London. Their five-year-old daughter has arrived back in Britain, after making the “bittersweet” decision to bring her home

8/50 10 October 2019

Irish Prime Minister Leo Varadkar and British Prime Minister Boris Johnson at Thornton Manor. Their meeting focused on further Brexit proposals

9/50 9 October 2019

Wales survived an almighty scare against Fiji to secure quarter-final spot at the rugby world cup. Warren Gatland’s side recovered from a 10-0 deficit thanks to a hat-trick from Josh Adams

10/50 8 October 2019

Protesters dubbed the Red Rebels at Millbank at the junction with Great College Street, during an Extinction Rebellion protest in Westminster

11/50 7 October 2019

Final preparations are made in front of a reproduction of Michelangelo’s ‘The Last Judgement’, ahead of the opening of for the ‘Michelangelo: A Different View’ exhibition at Hull Minister

12/50 6 October 2019

A car drives through a flooded street in Whitley Bay in Northumberland

13/50 5 October 2019

Thousands took to the streets of Edinburgh today to march in support of a second Scottish independence referendum

14/50 4 October 2019

A 12ft sculpture of a gorilla, entitled ‘Gorilla Apocalypse’, created by Luke Kite entirely from scrap car bumpers and panels discarded in the last decade is on display at the British Ironwork Centre in Oswestry, Shropshire

15/50 3 October 2019

Police stands in front of the Treasury building during an Extinction Rebellion protest in London

16/50 2 October 2019

Ex-Thomas Cook employees demonstrate in London after delivering a petition calling for a full inquiry into Thomas Cook’s collapse and for the company’s directors to pay back their bonuses

17/50 1 October 2019

A road in Alum Rock, Birmingham is flooded after persistent heavy rain

18/50 30 September 2019

Two tourists pose for pictures in front of Union and EU flags outside the Houses of Parliament in London

19/50 29 September 2019

A sheep on London Bridge as Freemen of the City of London took up their historic entitlement to drive sheep over the bridge, which was once London’s only river crossing

20/50 28 September 2019

An Aldabra giant tortoise is fed watermelon as a treat at the Malvern Autumn Show, at the Three Counties Showground near Malvern in Worcestershire

21/50 27 September 2019

Gallery assistants pose with an artwork entitled ‘Devolved Parliament’ by British artist Banksy, during a press view in London ahead of Sotheby’s contemporary art sale, as part of the Frieze Art Fair

22/50 26 September 2019

England’s Jonathan Joseph is tackled by United State’s Marcel Brache during their group match at the Rugby World Cup in Japan. England scored seven tries on their way to winning 45-7

23/50 25 September 2019

Tributes for former Rangers player Fernando Ricksen at Ibrox Stadium. Today, the funeral procession will pass Ibrox Stadium before making the journey to Wellington Church

24/50 24 September 2019

A person dressed as a caricature of Prime Minister Boris Johnson in a prison uniform stands outside the Supreme Court after it ruled that his decision to suspend Parliament was illegal

25/50 23 September 2019

Thomas Cook aircraft are parked up at Manchester Airport on the day they collapsed after rescue talks failed. A total of 22,000 jobs – including 9,000 in UK – are to be lost following administration. More than 150,000 British holidaymakers need to be brought home, with the government and CAA hiring dozens of charter planes to fly customers home free of charge

26/50 22 September 2019

Fire performer Penella Bee performs before people take part in the North East Skinny Dip at Druridge Bay in Nothumberland, an annual event that marks the Autumn Equinox and raises money for MIND – the Mental Health Charity

27/50 21 September 2019

Protesters gather for a march and rally organised by “The People’s Vote” in Brighton, to call for politicians to give the public a final say referendum on Brexit

28/50 20 September 2019

Protesters in London joined millions across world to demand urgent action to save planet in the largest environmental protest in history

29/50 19 September 2019

Rapper Dave poses with the Mercury Prize: Albums of the Year Award at Apollo

30/50 18 September 2019

A surfer in action during sunrise at Tynemouth on the north east coast

31/50 17 September 2019

Protesters dressed as the Incredible Hulk and Robocop outside the Supreme Court in London where judges are due to consider legal challenges to Prime Minister Boris Johnson’s decision to suspend Parliament. The Supreme Court will hear appeals over three days from two separate challenges to the prorogation of Parliament brought in England and Scotland

32/50 16 September 2019

Farmer Tom Hoggard harvests pumpkins at Howe Bridge Farm in Yorkshire, ahead of Halloween

33/50 15 September 2019

Team Europe celebrate winning the Solheim Cup at Gleneagles in Auchterarder, Scotland. Europe won the last three singles matches to claim victory 14½-13½
Sunset at St Mary’s Lighthouse in Whitley Bay

35/50 13 September 2019

Activists from PETA stage a demonstration outside a venue during London Fashion Week in London, Britain

36/50 12 September 2019

Australia’s Marnus Labuschagne attempts to stop a boundary in the fifth Test

37/50 11 September 2019

Storm clouds gather over the pier just off the North East coast at South Shields

38/50 10 September 2019

The peloton rides past the Angel of the North during stage four of the Tour of Britain from Gateshead to Kendal

39/50 9 September 2019

A penny farthing cyclist rides past St. John’s, Smith Square, Westminster, London

40/50 8 September 2019

Australia celebrate the wicket of England’s Craig Overton, which meant they won the fourth test and retained the Ashes

41/50 7 September 2019

Manchester City celebrate after Caroline Weir scored during their Women’s Super League match against Manchester United at Etihad Stadium. The WSL attendance record was smashed with 31,213 people watching the first Manchester derby of Women’s Super League era – nearly six times the previous WSL record

42/50 6 September 2019

A bull bumps into a plain clothes police officer (left) while being walked by Prime Minister Boris Johnson during his visit to Darnford Farm in Banchory near Aberdeen. It coincided with the publication of Lord Bew’s review and an announcement of extra funding for Scottish farmers

43/50 5 September 2019

First Minister Nicola Sturgeon cuts the hair of David Torrance MSP raising £1000 for the charity Maggie’s Centre in Kirkcaldy at the Scottish Parliament in Edinburgh

44/50 4 September 2019

Australia’s David Warner looks dejected after being dismissed by England’s Stuart Broad during day one of the fourth Ashes Test at Old Trafford in Manchester

45/50 3 September 2019

Anti Brexit demonstrators attend a protest at Parliament Square. Lawmakers returned from their summer recess Tuesday for a pivotal day in British politics as they challenged Prime Minister Boris Johnson’s insistence that the UK leave the European Union on 31 October, even without a withdrawal agreement to cushion the economic blow

46/50 2 September 2019

Set building begins on Waterloo Place in Edinburgh ahead of filming for Fast and Furious 9

47/50 1 September 2019

Members of the Royal Southern Yacht Club and the Island Sailing Club take part during the annual cricket match between the clubs, which takes place on the Bramble Bank sandbank in the middle of the Solent at low tide
Anti-Brexit protesters demonstrate at Whitehall in London

49/50 30 August 2019

One of the iconic ‘Girl with Balloon’ artworks by anonymous street artist Banksy is carried near one of the original locations the artwork appeared at on the Southbank in London

50/50 29 August 2019

The sun rises over the sculpture “The Couple” by artist Sean Henry, at Newbiggin-by-the-sea in Northumberland

Huda Elmi, another member of the party’s NEC, also echoed Mr Lansman’s comments. “Being a Labour MP means opposing the Tories when they try to destroy our country,” she said. 

“This reckless sellout deal is even worse than Theresa May’s, and any Labour MP that sides with Boris Johnson has no right to stand at the next election.”

Speaking earlier on Friday, John McDonnell said Labour MPs would be on a strict three-line whip to vote down the deal on Saturday – the first sitting of the Commons since the Falklands conflict.

“This is a three line-line whip and the chief whip, in the normal way, will determine the consequences for anyone who doesn’t vote for it,” he said.

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“I”m not the chief whip thank goodness; I’ve got enough on my plate,” he told BBC Radio 4’s Today programme.

So far, only a handful of Labour MPs have publicly suggested they will back Mr Johnson’s deal that EU leaders signed off on Thursday at the European Council summit.

Graham Stringer, an MP who voted against Theresa May’s Brexit deal, said on Friday he could also defy Labour’s whip and vote for the new agreement, adding he will “consider whether, if this deal goes down, we won’t get Brexit at all.”

“But if I thought that we wouldn’t get Brexit at all, then I would consider voting for it,” he added.