Tom Watson has won his battle to stay on as Labour’s deputy leader, as party left-wingers were forced to abandon an attempt to topple him.

The move to scrap the post altogether was dropped after Jeremy Corbyn intervened to propose a “review” instead – kicking the controversy into the long grass.

The climbdown came after leading trade unions joined former Labour leaders in condemning the shock putsch, led by Jon Lansman, the Momentum founder and Corbyn ally.

Mr Watson himself attacked it as a “drive-by shooting” and like something that “happens in Venezuela” – revealing he had been given no prior warning.

Mr Corbyn has refused to comment publicly on the controversy, but a party source said he had proposed a “review of the position of deputy leader” instead, at today’s national executive committee (NEC) meeting.

Labour Party conference 2018: in pictures Show all 24 1 /24 Labour Party conference 2018: in pictures Labour Party conference 2018: in pictures Leader Jeremy Corbyn addresses a pre-conference rally at Pier Head in Liverpool on Saturday Getty Labour Party conference 2018: in pictures Deputy leader Tom Watson cycles at the party conference as part of the Labour Cycles scheme PA Labour Party conference 2018: in pictures Leader Jeremy Corbyn and Deputy Leader Tom Watson sit together on stage on Sunday Reuters Labour Party conference 2018: in pictures Shadow Chancellor John McDonnell speaks at a fringe event at the party conference on Sunday REUTERS Labour Party conference 2018: in pictures Delegates are welcomed to the conference at the Arena and Convention Centre in Liverpool Getty Labour Party conference 2018: in pictures Shadow Chancellor John McDonnell speaks at a fringe event at the party conference Reuters Labour Party conference 2018: in pictures Leader Jeremy Corbyn and Shadow Foreign Secretary Emily Thornberry attend a vigil in Liverpool for those who are affected by the war in Yemen PA Labour Party conference 2018: in pictures Anti-Brexit supporters demonstrate outside the conference in Liverpool on Sunday Getty Labour Party conference 2018: in pictures Anti-Brexit supporters demonstrate outside the conference in Liverpool on Sunday PA Labour Party conference 2018: in pictures Mayor of London Sadiq Khan arrive at the conference on Sunday EPA Labour Party conference 2018: in pictures Shadow Chancellor John McDonnell speaks at a fringe event at the party conference EPA Labour Party conference 2018: in pictures Delegates at the Arena and Convention Centre in Liverpool, where the conference is being held PA Labour Party conference 2018: in pictures Badges worn by a delegate at the conference on Sunday EPA Labour Party conference 2018: in pictures Shadow Home Secretary Diane Abbott speaks at a fringe event at the party conference EPA Labour Party conference 2018: in pictures Anti-Brexit supporters demonstrate outside the conference in Liverpool on Sunday Reuters Labour Party conference 2018: in pictures Deputy leader Tom Watson poses for a selfie on Sunday AFP/Getty Labour Party conference 2018: in pictures Leader Jeremy Corbyn listens to a speech on Sunday Getty Labour Party conference 2018: in pictures General Secretary of the Labour Party is welcomed to the stage by leader Jeremy Corbyn on Sunday Reuters Labour Party conference 2018: in pictures An anti-Brexit protester Reuters Labour Party conference 2018: in pictures Leader Jeremy Corbyn speaks at a vigil in Liverpool for those who are affected by the war in Yemen PA Labour Party conference 2018: in pictures An anti-Brexit protester AFP/Getty Labour Party conference 2018: in pictures Anti-Brexit supporters demonstrate outside the conference in Liverpool on Sunday AFP/Getty Labour Party conference 2018: in pictures Leader Jeremy Corbyn and Deputy Leader Tom Watson sit together on stage on Sunday Reuters Labour Party conference 2018: in pictures Anti-Brexit supporters demonstrate outside the conference in Liverpool on Sunday Reuters

“This will consider how democratic accountability can be strengthened to give members a greater say, expanding the number of elected positions, and how diverse representation can be further improved,” the source said, adding: “The NEC agreed to his proposal.”

Nevertheless, the controversy has meant the annual conference has opened in Brighton with Labour again in a state of civil war, even before rows over Brexit policy begin.

One source told ITN News that the plot to bring down Mr Watson had been “cooked up” without Mr Corbyn’s knowledge by Mr Lansman and Karie Murphy, his chief of staff.

But few in the party will believe that, given the Labour leader’s refusal to speak out publicly in Mr Watson’s support and the growing divisions between the pair.

On Friday evening, Mr Lansman’s initial attempt to scrap the deputy leader’s post failed at an NEC meeting, but he was due to have a second attempt on Saturday morning.

If he had received the ruling body’s backing, the issue would have been put to Labour members in a conference vote in Brighton early next week.

Elected to the position in 2015, Mr Watson’s relations with his leader deteriorated over his attacks on antisemitism in the party and his call for a new Brexit referendum before a general election.

Unison union boss Dave Prentis criticised the attempt to topple him, tweeting: “Our sole focus at Labour conference this week should be on taking the fight to Boris Johnson.

Tim Roache, the GMB union general secretary, said: “We are weeks from a Gen Election and have a fantastic manifesto in the making and nothing must detract from that.”

Shop stewards for Labour backbenchers said: “Today’s outrageous proposals to remove the position of deputy leader of the Labour party are counterproductive, entirely factional and undermine the unity that the party have been striving for.”

And Tony Blair attacked an “undemocratic, damaging and politically dangerous” move that revealed “a quite extraordinary level of destructive sectarianism”.

Mr Corbyn, quizzed on the Brighton seafront, dodged the question of when he first knew of the plot, but said: “The conference will move on to defeating austerity, to the green industrial revolution, green new deal that we are putting forward and giving the people a final say on Brexit.

“Our NEC left this morning in a happy and united mood.”

Mr Lansman himself struck a contrite note on Twitter, saying: “I welcome & fully support Jeremy’s proposal to review Tom Watson’s position.