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Labour veteran Alan Johnson hit out at Jeremy Corbyn and Momentum after the party's worst election performance since the 1930s.

Mr Johnson served in a number of Cabinet positions under Tony Blair's Labour government, including Home Secretary, and was also Shadow Chancellor when his party went into opposition in 2011.

Speaking on ITV news after a disastrous exit poll predicted a Boris Johnson landslide, and sat next to Momentum founder Jon Lansman, Mr Johnson laid the blame squarely at the feet of the left wing elements of the party.

He said: "I live in a working class community, and I have known Jon [Lansman] for many years now - he's been around from the Bennite days.

General Election Night: December 2019 - In pictures 45 show all General Election Night: December 2019 - In pictures 1/45 Prime Minister Boris Johnson and his partner Carrie Symonds enter Downing Street as the Conservatives celebrate a sweeping election victory Jeremy Selwyn 2/45 Prime Minister Boris Johnson with partner Carrie Symonds and dog Dilyn at the count for the Uxbridge & Ruislip South constituency in the 2019 General Election PA 3/45 First Minister Nicola Sturgeon celebrates with supporters at the SEC Centre in Glasgow PA 4/45 Lib Dem leader Jo Swinson reacts as she loses her East Dumbartonshire constituency, during the count at the Leisuredome, Bishopbriggs PA 5/45 Labour leader Jeremy Corbyn speaks after the results was given at Sobell Leisure Centre for the Islington North constituency for the 2019 General Election PA 6/45 Boris Johnson press conference Jeremy Selwyn 7/45 Michael Gove Jeremy Selwyn 8/45 Dominic Cummings Jeremy Selwyn 9/45 Prime Minister Boris Johnson's partner Carrie Symonds and dog Dilyn arriving for the count for the Uxbridge & Ruislip South constituency in the 2019 General Election PA 10/45 REUTERS 11/45 Britain's Prime Minister Boris Johnson leaves the Conservative Party's headquarters Reuters 12/45 Britain's opposition Labour Party leader Jeremy Corbyn leaves the Labour Party's headquarters Reuters 13/45 A member of the counting staff yawns during the count at the SEC Centre in Glasgow PA 14/45 Democratic Unionist Party (DUP) leader Arlene Foster (C) reacts after learning that Deputy Leader of the DUP (Democratic Unionist Party) Nigel Dodds has lost his seat to Sinn Fein's new MP for North Belfast John Finucane at the count centre in Belfast AFP via Getty Images 15/45 DUP Westminster leader Nigel Dodds reacts after losing his seat as Sinn Fein candidate John Finucane is declared the winner in the Belfast count centre Getty Images 16/45 A police officer breaks up a fight while Hayes and Harlington MP John McDonnell speaks at the vote declaration after retaining his seat Getty Images 17/45 Carla Lockhart of the DUP is elected as MP for Upper Bann at Meadowbank Sports Arena in Magherafelt Co Londonderry as counting begins Westminster election PA 18/45 Labour Party leader Jeremy Corbyn (R) and Shadow Foreign Secretary Emily Thornberry meet after both retaining their Parliamentary seats following the count at Sobell leisure centre Getty Images 19/45 Liberal Democrats candidate for Edinburgh West, Christine Jardine retains her seat at the Royal Highland Centre, Edinburgh PA 20/45 Sinn Fein's John Finucane celebrates with party leader Mary Lou McDonald (left) and deputy leader Michelle O'Neill after winning in the Belfast North constituency at the Titanic exhibition centre, Belfast PA 21/45 A cat sits on the step of 10 Downing Street as Boris Johnson looks set to be returned there as Prime Minister after early Conservative gains in the General Election results PA 22/45 Britain's Prime Minister and Conservative leader Boris Johnson and his partner Carrie Symonds arrive at the count centre in Uxbridge, west London AFP via Getty Images 23/45 Conservative Party parliamentary candidate Jacob Rees-Mogg leaves, after winning the North East Somerset constituency, at the Sports Training Village, University of Bath Getty Images 24/45 Conservative Party parliamentary candidate Jacob Rees-Mogg's wife Helena and son Peter watch the results of the North East Somerset constituency at the Sports Training Village, University of Bath Getty Images 25/45 Supporters cheer as Green Party candidate Caroline Lucas is announced as the winner for the constituency of Brighton Pavilion at a counting centre Reuters 26/45 Conservative candidate Aaron Bell is declared the winner of the Newcastle-Under-Lyme seat PA 27/45 Michelle Dewberry, the former winner of The Apprentice and Brexit Party candidate for Hull West & Hessle, with former Crystal Palace owner Simon Jordan after she failed to win the Kingston upon Hull West & Hessle seat at the Guildhall in Hull in the 2019 General Election PA 28/45 Britain's Prime Minister Boris Johnson reacts as he and his girlfriend Carrie Symonds arrive at the Conservative Party's headquarters Reuters 29/45 Brexit Party candidate Richard Tice is seen after Labour Party candidate Mike Hill is announced as the winner for the constituency of Hartlepool at a counting centre for Britain's general election in Hartlepool Reuters 30/45 Jeremy Corbyn, leader of the Labour Party, pauses while speaking at the vote count in his Islington North constituency Getty Images 31/45 Conservative Party candidate Dominic Raab arrives at a counting centre in Esher Reuters 32/45 Labour Party candidate Sharon Hodgson is announced as the winner for the constituency of Washington and Sunderland West Reuters 33/45 Volunteers get counting after the polls closed in the General election Nigel Howard 34/45 Volunteers get counting IN bARNET after the polls closed in the General election Nigel Howard 35/45 Labour in conversation during the General Election count in Barnet Nigel Howard 36/45 General Election Count, Barnet Nigel Howard 37/45 The results of an exit poll are projected onto the outside of Broadcasting House AP 38/45 Independent candidate Count Binface poses after arriving at a counting centre Reuters 39/45 The Labour Party's Chi Onwurah after winning Newcastle Upon Tyne Central PA 40/45 The results of the exit poll are projected onto the outside of Broadcasting House AP 41/45 Labour Party candidate Bridget Phillipson stands next to Brexit Party candidate Kevin Yuill after she was announced as the winner for the constituency of Houghton and Sunderland South Reuters 42/45 A member of the Monster Raving Loony Party arrives at a counting centre in Islington Reuters 43/45 General Election Count, Barnet Nigel Howard 44/45 Volunteers get counting after the polls closed in the General election Reuters 45/45 Prime Minister Boris Johnson and his girlfriend Carrie Simmonds with their dog Dilyn Jeremy Selwyn 1/45 Prime Minister Boris Johnson and his partner Carrie Symonds enter Downing Street as the Conservatives celebrate a sweeping election victory Jeremy Selwyn 2/45 Prime Minister Boris Johnson with partner Carrie Symonds and dog Dilyn at the count for the Uxbridge & Ruislip South constituency in the 2019 General Election PA 3/45 First Minister Nicola Sturgeon celebrates with supporters at the SEC Centre in Glasgow PA 4/45 Lib Dem leader Jo Swinson reacts as she loses her East Dumbartonshire constituency, during the count at the Leisuredome, Bishopbriggs PA 5/45 Labour leader Jeremy Corbyn speaks after the results was given at Sobell Leisure Centre for the Islington North constituency for the 2019 General Election PA 6/45 Boris Johnson press conference Jeremy Selwyn 7/45 Michael Gove Jeremy Selwyn 8/45 Dominic Cummings Jeremy Selwyn 9/45 Prime Minister Boris Johnson's partner Carrie Symonds and dog Dilyn arriving for the count for the Uxbridge & Ruislip South constituency in the 2019 General Election PA 10/45 REUTERS 11/45 Britain's Prime Minister Boris Johnson leaves the Conservative Party's headquarters Reuters 12/45 Britain's opposition Labour Party leader Jeremy Corbyn leaves the Labour Party's headquarters Reuters 13/45 A member of the counting staff yawns during the count at the SEC Centre in Glasgow PA 14/45 Democratic Unionist Party (DUP) leader Arlene Foster (C) reacts after learning that Deputy Leader of the DUP (Democratic Unionist Party) Nigel Dodds has lost his seat to Sinn Fein's new MP for North Belfast John Finucane at the count centre in Belfast AFP via Getty Images 15/45 DUP Westminster leader Nigel Dodds reacts after losing his seat as Sinn Fein candidate John Finucane is declared the winner in the Belfast count centre Getty Images 16/45 A police officer breaks up a fight while Hayes and Harlington MP John McDonnell speaks at the vote declaration after retaining his seat Getty Images 17/45 Carla Lockhart of the DUP is elected as MP for Upper Bann at Meadowbank Sports Arena in Magherafelt Co Londonderry as counting begins Westminster election PA 18/45 Labour Party leader Jeremy Corbyn (R) and Shadow Foreign Secretary Emily Thornberry meet after both retaining their Parliamentary seats following the count at Sobell leisure centre Getty Images 19/45 Liberal Democrats candidate for Edinburgh West, Christine Jardine retains her seat at the Royal Highland Centre, Edinburgh PA 20/45 Sinn Fein's John Finucane celebrates with party leader Mary Lou McDonald (left) and deputy leader Michelle O'Neill after winning in the Belfast North constituency at the Titanic exhibition centre, Belfast PA 21/45 A cat sits on the step of 10 Downing Street as Boris Johnson looks set to be returned there as Prime Minister after early Conservative gains in the General Election results PA 22/45 Britain's Prime Minister and Conservative leader Boris Johnson and his partner Carrie Symonds arrive at the count centre in Uxbridge, west London AFP via Getty Images 23/45 Conservative Party parliamentary candidate Jacob Rees-Mogg leaves, after winning the North East Somerset constituency, at the Sports Training Village, University of Bath Getty Images 24/45 Conservative Party parliamentary candidate Jacob Rees-Mogg's wife Helena and son Peter watch the results of the North East Somerset constituency at the Sports Training Village, University of Bath Getty Images 25/45 Supporters cheer as Green Party candidate Caroline Lucas is announced as the winner for the constituency of Brighton Pavilion at a counting centre Reuters 26/45 Conservative candidate Aaron Bell is declared the winner of the Newcastle-Under-Lyme seat PA 27/45 Michelle Dewberry, the former winner of The Apprentice and Brexit Party candidate for Hull West & Hessle, with former Crystal Palace owner Simon Jordan after she failed to win the Kingston upon Hull West & Hessle seat at the Guildhall in Hull in the 2019 General Election PA 28/45 Britain's Prime Minister Boris Johnson reacts as he and his girlfriend Carrie Symonds arrive at the Conservative Party's headquarters Reuters 29/45 Brexit Party candidate Richard Tice is seen after Labour Party candidate Mike Hill is announced as the winner for the constituency of Hartlepool at a counting centre for Britain's general election in Hartlepool Reuters 30/45 Jeremy Corbyn, leader of the Labour Party, pauses while speaking at the vote count in his Islington North constituency Getty Images 31/45 Conservative Party candidate Dominic Raab arrives at a counting centre in Esher Reuters 32/45 Labour Party candidate Sharon Hodgson is announced as the winner for the constituency of Washington and Sunderland West Reuters 33/45 Volunteers get counting after the polls closed in the General election Nigel Howard 34/45 Volunteers get counting IN bARNET after the polls closed in the General election Nigel Howard 35/45 Labour in conversation during the General Election count in Barnet Nigel Howard 36/45 General Election Count, Barnet Nigel Howard 37/45 The results of an exit poll are projected onto the outside of Broadcasting House AP 38/45 Independent candidate Count Binface poses after arriving at a counting centre Reuters 39/45 The Labour Party's Chi Onwurah after winning Newcastle Upon Tyne Central PA 40/45 The results of the exit poll are projected onto the outside of Broadcasting House AP 41/45 Labour Party candidate Bridget Phillipson stands next to Brexit Party candidate Kevin Yuill after she was announced as the winner for the constituency of Houghton and Sunderland South Reuters 42/45 A member of the Monster Raving Loony Party arrives at a counting centre in Islington Reuters 43/45 General Election Count, Barnet Nigel Howard 44/45 Volunteers get counting after the polls closed in the General election Reuters 45/45 Prime Minister Boris Johnson and his girlfriend Carrie Simmonds with their dog Dilyn Jeremy Selwyn

"And I'm afraid the working class have always been a big disappointment for Jon and his cult.

"Corbyn was a disaster on the doorstep. Everyone knew that he couldn't lead the working class out of paper bag."

Mr Lansman is a dedicated supporter of Jeremy Corbyn, sits on the party's powerful National Executive Committee, and runs campaigning group momentum.

Momentum has been instrumental in building support for Mr Corbyn within the Labour Party membership, which grew massively following reforms under Ed Miliband.

However, some say it has pushed the party further left and away from the centre ground that saw the party in power for 13 years.

Continuing his attack on Mr Lansman, Mr Johnson added: "Now Jon's developed this momentum group, this party-within-a-party.

"Aiming to keep the purity, the culture of betrayal goes on. You'll hear it now, more and more over the next few days as this little cult get their act together."