Theresa May's plan to renegotiate Britain's Brexit Withdrawal Agreement has met a wall of resistance from the EU, with the continent's most senior politicians and officials lining up to insist the deal cannot be unpicked.
In a dramatic night at Westminster on Tuesday, the Prime Minister succeeded in uniting her party behind a plan to rewrite the deal to address concerns about the Irish backstop.
But senior figures in Brussels, Berlin, Paris and Dublin warned that the demand only made a no-deal Brexit more likely as the clock ticks down to the UK's scheduled departure from the European Union on March 29.
#Brexit will take place in 2 months. Time is running out. We are ready to talk about the future but now is the time to agree on the conditions of the separation. The withdrawal agreement that is on the table is the best possible agreement. Let us not reopen it
— France Diplomacy🇫🇷 (@francediplo_EN) January 30, 2019
European Commission president Jean-Claude Juncker described the Agreement reached after 18 months of negotiation last November as "the best and only deal possible".
And he told MEPs in the European Parliament in Brussels: "The debate and votes in the House of Commons yesterday do not change that.
"The Withdrawal Agreement will not be renegotiated."
Mr Juncker said he would stay in close contact with Mrs May and would "listen to her ideas".
But he added: "I will also be extremely clear about the position of the EU. Yesterday's vote has further increased the risk of a disorderly exit of the UK."
Tuesday's Commons vote demanded the replacement of the backstop with "alternative arrangements" to avoid a hard border on the island of Ireland.
But the EU's chief negotiator Michel Barnier told MEPs that "no-one, on one side or the other, can say very clearly and precisely what form these alternative arrangements will take".
Insisting that the plan remains "at the heart" of the EU's efforts to protect the single market", Mr Barnier said: "The backstop is part and parcel of the Withdrawal Agreement and this agreement will not be renegotiated."
The Prime Minister's official spokesman said: "The EU had said it was seeking clarity – there had been suggestions that the backstop was not the main issue of concern, which had originated in Brussels.
"I think yesterday a clear message was given by the House of Commons that the backstop is the concern which MPs have, and that if we can find a way to address those concerns that there is a stable majority for getting support for the deal in Parliament."
Mrs May met privately with Jeremy Corbyn to discuss the way ahead, after clashing with the Labour leader at Prime Minister's Questions in the Commons.
Having boycotted earlier cross-party talks, Mr Corbyn said he was ready to discuss a "sensible" approach to Brexit after MPs voted on Tuesday night to rule out no deal.
A Labour spokesman later said the tone of the talks was "serious and engaged", and the pair had agreed to meet again.
Describing it as "a useful exchange of views", the spokesman added: "Jeremy made the case for our alternative plan."
Mrs May was later due to speak by phone with European Council president Donald Tusk and Irish Taoiseach Leo Varadkar.
In the Commons, Mr Corbyn demanded to know which of her red lines Mrs May was prepared to compromise on in order to avoid a no-deal Brexit.
"It really is time that the Prime Minister acknowledged she has got to move on from the red lines she put down in the first place," he said.
But the PM told Mr Corbyn he had opposed "every move by this Government to get a deal" and "he is the one risking no deal".
In dramatic scenes on Tuesday night, MPs voted by a margin of 317 to 301 to back a plan – the "Brady amendment" – which requires the PM to replace the Agreement's controversial backstop with "alternative arrangements" to keep the Irish border open after Brexit.
But asked five times on BBC Radio 4's Today programme what this "alternative" involved, Brexit Secretary Stephen Barclay was unable to provide any specific explanation.
Mr Barclay said the UK was "exploring in terms of the use of technology... looking at things like the time limit" to deal with the backstop.
He added: "There are a number of options, there are issues in terms of having time limits, issues in terms of exit clauses, issues in terms of technology, and this will be the nature of the negotiation with the European Union in the coming days."
Downing Street has suggested that the UK's position could involve a time-limit or exit clause to the backstop or swapping it for a free trade agreement, as proposed in the so-called Malthouse Compromise drawn up by MPs from the Tories' Remain and Leave wings.
But the suggestion that the deal struck between the Government and Brussels could be unpicked was rejected by senior figures across the EU. Mr Varadkar told the Irish parliament that the EU is not offering a renegotiation of the existing Brexit deal.
"A renegotiation is not on the table," said the Taoiseach. "There's no plans to organise an emergency summit to discuss any changes to the guidelines. Nor is there any pressure to hold one."
French President Emmanuel Macron said the Withdrawal Agreement was "not renegotiable", while a spokesman for German Chancellor Angela Merkel said that reopening the deal was "not on the agenda".
— GermanForeignOffice (@GermanyDiplo) January 30, 2019
Germany's foreign minister, Heiko Maas, said: "Germany and the entire Union are firmly on Ireland's side. We will not allow Ireland to be isolated on this issue."
French Europe minister Nathalie Loiseau said: "The Withdrawal Agreement that is on the table is the best possible agreement. Let us not reopen it."
Brexiteer ringleader Jacob Rees-Mogg made clear on Wednesday that he remains prepared to see the UK leave without a deal on March 29 if the EU refuses to reopen negotiations.
"If (the EU) think the Withdrawal Agreement is non-negotiable then we will have to leave without an agreement," he told TalkRadio. "Do they want the £39 billion, do they want an agreement... or us just to leave? It's up to them."
Conservative former Cabinet minister Sir Oliver Letwin said he did not think it was "at all likely" that Mrs May would succeed in getting changes to her Withdrawal Agreement.
He told BBC Radio 5 Live: "If you were a betting person, would you bet two weeks from now that she is going to come back with something that will obtain a majority? I'd have to say, I wouldn't bet on it, no."