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Thousands of people are set to march on Parliament Square tonight in support of Jeremy Corbyn after the Labour party was plunged into civil war over the weekend.

More than 3,000 supporters have pledged to attend the demonstration, called #KeepCorbyn, Build our movement, while a further 6,000 have declared an interest in going.

The event was posted on Facebook by left-wing group Momentum hours after 12 members of Mr Corbyn’s shadow cabinet left their posts on a day his leadership descended into a full blown crisis.

Shadow chancellor John McDonnell as well as MPs Diane Abbott and Rebecca Long-Bailey are due to speak in support of the under fire Labour leader at the protest, which starts at 6pm.

A message on a Facebook page for the protest reads: “The future is uncertain. We face a Tory Brexit, Cameron has resigned and we are likely to have a general election in the coming months with the potential of Britain lurching yet further to the right.

“A small number of Labour MPs are using this as an opportunity to oust Jeremy, disrespect the Labour membership who elected him and disregard our movement for a new kind of politics.

“We cannot let this undemocratic behaviour succeed.”

Messages of support have also been posted from those hoping to attend the protest while others called on Mr Corbyn to stand aside.

Labour senior MPs' resignations (and one sacking) 35 show all Labour senior MPs' resignations (and one sacking) 1/35 Hilary Benn, shadow Foreign Secretary - sacked Neil Hall/Reuters 2/35 Lord Falconer, shadow Justice Secretary - resigned Jonathan Brady/PA 3/35 Gloria De Piero, shadow Minister for Young People and Vote Registration - resigned AFP/Getty Images 4/35 Heidi Alexander, shadow Secretary for Health - resigned Gareth Fuller/PA 5/35 Lilian Greenwood, shadow Transport Secretary - resigned AFP/Getty Images 6/35 Vernon Coaker, shadow Northern Ireland Secretary - resigned Jonathan Brady/PA 7/35 Yvonne Fovargue, Yvonne Fovargue, shadow Business - resigned 8/35 Neil Coyle, parliamentary aide to Chris Bryant - resigned AFP/Getty Images 9/35 Seema Malhotra, shadow Chief Secretary to the Treasury - resigned Lauren Hurley/PA 10/35 Alex Cunningham, shadow Natural Environment - resigned 11/35 Kerry McCarthy, shadow Secretary of State for the Environment - resigned Gareth Fuller/PA 12/35 Wayne David, shadow Cabinet Office, Scotland and Justice - resigned www.waynedavid.co.uk 13/35 Diana Johnson, shadow Foreign Minister -resigned John Stillwell/PA 14/35 Steve Reed, shadow Local Government - resigned Peter Macdiarmid/Getty Images 15/35 Anna Turley, shadow Minister for Civil society - resigned Ian Forsyth/Getty Images 16/35 Karl Turner, shadow Attorney General - resigned John Stillwell/PA 17/35 Ian Murray, shadow Scottish Secretary - resigned Daniel Leal-Olivas/PA 18/35 Lucy Powell, shadow Education Minister - resigned Jonathan Brady/PA 19/35 Chris Bryant, shadow Leader of the House of Commons - resigned Jonathan Brady/PA 20/35 Toby Perkins, shadow Armed Forces Minister - resigned John Stillwell/PA 21/35 Stephen Kinnock, parliamentary private secretary to Angela Eagle - resigned Stefan Rousseau/PA 22/35 Jess Phillips, parliamentary private secretary to Lucy Powell - resigned PA 23/35 Angela Eagle, shadow First Secretary of State and Secretary of State for Business, Innovation and Skills - resigned Ben Pruchnie/Getty Images 24/35 Lisa Nandy, shadow Energy Secretary - resigned Ben Pruchnie/Getty Images 25/35 Owen Smith, shadow Work and Pensions - resigned AFP/Getty Images 26/35 Nia Griffith, shadow Secretary of State for Wales - resigned Rex 27/35 Jenny Chapman, shadow Education - resigned www.jennychapman.co.uk 28/35 Roberta Blackman-Wood, shadow Housing and Communities and Local Government 29/35 Shadow Minister for Housing John Healey 30/35 Susan Elan Jones, shadow Wales Office minister 31/35 Sharon Hodgson, shadow minister for children 32/35 Melanie Onn, shadow deputy leader of the Commons 33/35 Kate Green, shadow equalities minister 34/35 Thangam Debbonaire, shadow culture minister 35/35 Jack Dromey DM pics 1/35 Hilary Benn, shadow Foreign Secretary - sacked Neil Hall/Reuters 2/35 Lord Falconer, shadow Justice Secretary - resigned Jonathan Brady/PA 3/35 Gloria De Piero, shadow Minister for Young People and Vote Registration - resigned AFP/Getty Images 4/35 Heidi Alexander, shadow Secretary for Health - resigned Gareth Fuller/PA 5/35 Lilian Greenwood, shadow Transport Secretary - resigned AFP/Getty Images 6/35 Vernon Coaker, shadow Northern Ireland Secretary - resigned Jonathan Brady/PA 7/35 Yvonne Fovargue, Yvonne Fovargue, shadow Business - resigned 8/35 Neil Coyle, parliamentary aide to Chris Bryant - resigned AFP/Getty Images 9/35 Seema Malhotra, shadow Chief Secretary to the Treasury - resigned Lauren Hurley/PA 10/35 Alex Cunningham, shadow Natural Environment - resigned 11/35 Kerry McCarthy, shadow Secretary of State for the Environment - resigned Gareth Fuller/PA 12/35 Wayne David, shadow Cabinet Office, Scotland and Justice - resigned www.waynedavid.co.uk 13/35 Diana Johnson, shadow Foreign Minister -resigned John Stillwell/PA 14/35 Steve Reed, shadow Local Government - resigned Peter Macdiarmid/Getty Images 15/35 Anna Turley, shadow Minister for Civil society - resigned Ian Forsyth/Getty Images 16/35 Karl Turner, shadow Attorney General - resigned John Stillwell/PA 17/35 Ian Murray, shadow Scottish Secretary - resigned Daniel Leal-Olivas/PA 18/35 Lucy Powell, shadow Education Minister - resigned Jonathan Brady/PA 19/35 Chris Bryant, shadow Leader of the House of Commons - resigned Jonathan Brady/PA 20/35 Toby Perkins, shadow Armed Forces Minister - resigned John Stillwell/PA 21/35 Stephen Kinnock, parliamentary private secretary to Angela Eagle - resigned Stefan Rousseau/PA 22/35 Jess Phillips, parliamentary private secretary to Lucy Powell - resigned PA 23/35 Angela Eagle, shadow First Secretary of State and Secretary of State for Business, Innovation and Skills - resigned Ben Pruchnie/Getty Images 24/35 Lisa Nandy, shadow Energy Secretary - resigned Ben Pruchnie/Getty Images 25/35 Owen Smith, shadow Work and Pensions - resigned AFP/Getty Images 26/35 Nia Griffith, shadow Secretary of State for Wales - resigned Rex 27/35 Jenny Chapman, shadow Education - resigned www.jennychapman.co.uk 28/35 Roberta Blackman-Wood, shadow Housing and Communities and Local Government 29/35 Shadow Minister for Housing John Healey 30/35 Susan Elan Jones, shadow Wales Office minister 31/35 Sharon Hodgson, shadow minister for children 32/35 Melanie Onn, shadow deputy leader of the Commons 33/35 Kate Green, shadow equalities minister 34/35 Thangam Debbonaire, shadow culture minister 35/35 Jack Dromey DM pics

Malcolm Barnes posted: “Britain desperately needs a party that can lead, and unite the people.

“A party that can stand united before the British public and work tirelessly as statesmen to ensure that the British public are confident that someone is looking out for them.”

While Ali Alisadeh wrote: "He is a man with principle, he is a man ,who stand for humanities,peace,women rights, human rights, he has our mandate for leading Labour Party for next election.”

But Ben Dilks said: “Utterly embarrassing. Resign.”

On Sunday, 11 ministers resigned in protest at Mr Corbyn’s leadership hours after Hilary Benn was sacked as shadow foreign secretary amid claims he was plotting to challenge the leader.

But despite the series of resignations, Mr Corbyn issued a defiant statement late in the evening in which he said those who wanted to challenge his leadership would have to contest an election with him.

He said: “I regret there have been resignations today from my shadow cabinet. But I am not going to betray the trust of those who voted for me - or the millions of supporters across the country who need Labour to represent them.”

He also announced he was looking to reshape his shadow cabinet on Monday.

MPs are also today preparing to discuss a vote motion of no confidence in Mr Corbyn - tabled by the veteran backbencher Dame Margaret Hodge - at the weekly meeting of the Parliamentary Labour Party.

It is expected to be followed by a vote of MPs in a secret ballot the next day. Although the motion has no formal standing, rebels are hoping that if it is passed his position will become untenable.