Donald Tusk has delivered an ultimatum to MPs – back Theresa May’s deal in a vote next week or lose the chance of a short delay to Brexit.

The consequence of the European Council President’s remarks is if Westminster does not comply, then Britain faces crashing out of the European Union a week tomorrow.

Brussels sources said France, Spain, Belgium and possibly Italy were prepared to reject an extension without evidence the UK Parliament was ready to accept a deal and "break the deadlock".

Emmanuel Macron, the French President, in particular, is digging in his heels as he believes Brexit is delaying his plans for radically reforming the EU and needs to be brought to a conclusion.

But Lord Hague, the former Conservative leader, noted: “But of course he did not rule out agreeing to a longer delay…”

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He told ITV’s Peston last night: “He did say to get a short delay you have to pass the deal and it’s not surprising the EU says that because of course they legitimately asked the question: ‘Well what will change in a couple of months?’

“So if you want a short delay, you have to show that you’ve…taken this deal. I don’t think it’s surprising that he’s said that.”

Earlier, the Prime Minister signalled that she would quit if Brexit were delayed beyond her requested extension date of Sunday June 30.

Her request came in a letter to Mr Tusk ahead of her attendance at today's European Council and precisely 1,000 days after the 2016 referendum, when, by a 52 to 48 per cent majority, the UK voted to quit the EU.

During a fractious PMQs, Mrs May, who faced shouts of “resign” from opposition benches as Jeremy Corbyn accused her of causing a “full-scale national crisis,” made clear: “As Prime Minister, I am not prepared to delay Brexit any further than June 30."

The Labour leader accused Mrs May of plunging the country into a “full-scale national crisis” through her “incompetence, failure and intransigence”.

Ian Blackford for the SNP quoted the PM’s de facto deputy David Lidington, who last week told MPs that a short extension to Brexit without a deal would be “downright reckless”.

The Highland MP declared: “The Prime Minister has failed, this place has failed, and Scotland is watching…The people of Scotland deserve a choice on the future and, if Westminster fails, Scotland will act.”

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There was also a challenge from her own benches when Brexiteer Tory Peter Bone told her: “If you continue to apply for an extension to Article 50, you will be betraying the British people. If you don’t, you will be honouring their instruction.

“Prime Minister, it is entirely down to you; history will judge you at this moment. Which is it to be?”

Mrs May sparked outrage from opposition benches when she stressed she was against a long extension, which would result in Parliament “spending yet more endless hours contemplating its navel on Europe and failing to address the issues that matter to our constituents, such as schools, hospitals, security and jobs. The House has indulged itself on Europe for too long…”

Her comments later drew a withering response from her Conservative colleague and leading Remainer Dominic Grieve, who during a subsequent debate on Brexit, said her performance was the “worst moment I have experienced since I came into the Commons; I have never felt more ashamed to be a member of the Conservative Party”.

Denouncing the PM for castigating MPs for their “misconduct,” the former Attorney General added: “I could have wept…to see her reduced to these straits…simply zig-zagging all over the place rather than standing up for the national interest”.

During the day, Mrs May held a series of meetings with Cabinet ministers, Conservative MPs and opposition leaders about her extension request.

The mood within the Tory Party was grim with frontbenchers and backbenchers openly talking about her survival in No 10.

One member of the Government admitted: “She’s going to have to go; it’s all about when.”

Tory Brexiteer Nigel Evans said the PM had “failed” to deliver Brexit on March 29 and there were “now big question-marks as to whether she should be allowed to carry on and see whether she can do June 30 because there’s a growing number of people who think ‘time to move on’”.

Outwith Westminster, Nicola Sturgeon denounced “this weak PM failing to stand up to the hardliners and risking no deal instead”. The First Minister added: “She needs to go.”