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Labour’s Shadow Chancellor John McDonnell has said “it may well be” that another referendum on Brexit goes ahead.

Speaking on the Andrew Marr Show on BBC One Labour 's shadow chancellor said that a vote confirming any deal could happen - and Labour weren't ruling it out of negotiations.

Mr McDonnell told Andrew Marr: "That’s part of the negotiations that we’re having.

"I think the Conservatives had to recognise that if a deal is going to go through there might be a large number of MPs who will want a public vote. That’s the reality of it and we’ve got to take that into account.

He added: I don’t want to preclude anything at the moment and it’s exactly my criticism of the Prime Minister this weekend.

"These talks were meant to be confidence building, therefore confidentiality maintained, and the idea is to try and do the best not for party but for country and that’s what we’re trying to do."

It came as Mr McDonnell accused Theresa May May of betraying Labour's trust on crunch Brexit talks as ministers and their counterparts prepare to resume negotiations Tuesday.

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Shadow Chancellor John McDonnell said he did not trust the Prime Minister after details of potential compromises emerged.

The bitter rebuke dramatically cut the chances of a breakthrough to end the deadlock.

Mr McDonnell hit out after the PM issued a desperate last-ditch plea to Jeremy Corbyn for help in delivering Brexit.

The Tories are expected to cave into Labour demands for a customs union, as long as it is called something else, it was claimed.

A temporary customs arrangement would last until the next general election when parties can put forward alternatives.

Mrs May will also offer beefed-up laws protecting workers' rights.

"To the leader of the opposition, I say this: let's listen to what the voters said in the elections and put our differences aside for a moment.

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Let's do a deal,” the PM wrote in the Mail on Sunday.

“We have to find a way to break the deadlock - and I believe the results of the local elections give fresh urgency to this.”

Revelations of what a compromise could include infuriated Labour.

Accusing the Tory leader of breaking confidentiality and “an act of bad faith”, Mr McDonnell stormed: “She's jeopardised the negotiations for her own personal protection.”

Asked on the BBC if he trusted her, he hit back: “No, sorry, not after this weekend when she's blown the confidentiality.”

Talks had been marked by “real discipline”, he claimed, adding: “In negotiations what you try and do is establish a relationship.

“When you start undermining that relationship you undermine the confidence.

“I fully understand now why she couldn't negotiate a decent deal with our European partners if she behaves in this way.”

International Development Secretary Rory Stewart believed a pact could be agreed.

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He told Sky News: “I think a deal can be done, a lot of this rests on, to be honest, one man - whether Jeremy Corbyn really wants to deliver a Brexit deal.

"But I think if he wants to do it it will be actually surprisingly easy to do because our positions are very, very close."

However, Labour's Deputy Leader Tom Watson warned: “I don’t think we should give false hope on this.

“It’s going to be very difficult to find a negotiated settlement.”

Warning the PM and Mr Corbyn against striking a deal, Brexit Party leader Nigel Farage said that “if they push ahead with this it will be seen as a coalition of politicians agains the people and I think millions of people would give up on both Labour and the Conservatives. This would be the final betrayal”.

Some 104 Opposition MPs, mainly from Labour but also SNP , Change UK, Green and Plaid Cymru, have written to Mrs May and Mr Corbyn warning they will not back a "Westminster stitch-up" unless it is put to a second referendum.

Beleaguered Mrs May – still reeling from losing 1,300 seats in council elections - will be told to name a date for her departure this week or face fresh moves to oust her.

A Conservative Home poll found a record 82% of their party member panel respondents want the PM May to stand down and trigger a leadership election.

Last month it was 71%.

Sir Graham Brady, the chairman of the 1922 committee of Tory backbenchers,

said staying in a customs union could lead to a "catastrophic split" in the Conservative Party.

He is expected to issue her with an ultimatum to set a timetable for her departure, dubbed “Texit” in Westminster, or face the committee rewriting rules so she can be toppled before Christmas.

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The PM survived a confidence vote of MPs in December and, under existing rules, cannot be challenged again for 12 months.

Meanwhile, Mr Corbyn was challenged to a head-to-head TV debate with Mr Farage ahead of European Parliament elections on May 23.

The Brexit Party leader said: "There are five million voters out there, Labour voters, who voted to leave, particularly in the Midlands, the North, and South Wales.

"I would love between now and polling to have a debate with Jeremy Corbyn about this because people are very confused about what Labour are standing for."

Dismissing the idea, a Labour source said: “Jeremy took part in debates through the 2017 general election.

“But of course we would not do a head-to-head debate with only one of the parties standing, which has only just been formed and has no chance of forming a government.

“That would be bizarre.”