Theresa May has been accused of betrayal after giving way to Spain's demands over the future of Gibraltar, a disputed British overseas territory, in the latest concession created to keep the Brexit deal on track.
The Prime Minister is facing demands from MPs across the political spectrum to abandon her plan and go back to the negotiating table.
Amid a growing outcry over the government's concession, the prime minister insisted that nothing had changed over the UK's territorial claim to Gibraltar.
Meanwhile, the Telegraph said it has seen leaked Cabinet papers which suggest the PM is planning to "reframe the Brexit debate around migration" - by planning restrictions on low-skilled migrants coming to the United Kingdom - in a bid to attract the support of hard Brexiteers ahead of the House of Commons vote.
At 10am, a working session of the council begins, in relation to Article 50 which will remove the United Kingdom from the EU.
"But, if you just presented me terms, this deal or European Union membership, because we would effectively be bound by the same rules but without the control or voice over them, yes, I think this would be even worse than that".
She warned that rejecting the deal would lead to "more uncertainty and more division" and could result in Britain crashing out of the bloc without agreement - an outcome feared by many businesses.
'And then I think some of those other alternatives will need to come into play'.
But, keeping up pressure within her own Conservative party, her Brexit-supporting rival and former foreign minister Boris Johnson called on Saturday for the accord to be renegotiated.
Molly Scott Cato, a British MEP who represents Gibraltar, said it "looks like the government has sold out Gibraltar and abandoned talk of a future trade deal that works for the whole British family".More news: Vettel: "F1 will not be poorer without Alonso"
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As with long months spent trying to square the circle of pulling its troubled province of Northern Ireland out of the EU without creating a disruptive customs border with EU member Ireland, the Gibraltar dispute reflected problems with its European neighbors dating back to Britain's imperial past.
It was a rare awkward moment for the prime minister in a half-hour broadcast on the BBC News channel and Radio 5 Live hosted by Emma Barnett, in which several callers were notably supportive of Mrs May and some seemed concerned for her well-being.
"Personally there is no question of no Brexit because the Government needs to deliver on what people voted for in the referendum in 2016", she said.
A leaked document due to be agreed at a summit of EU leaders on Sunday will declare that the post-Brexit arrangements over fishing rights will build on the much-hated current arrangements, saying any future agreement must protect the rights of European fishing fleets.
With May due to meet European Union chief executive Jean-Claude Juncker and summit chair Donald Tusk at 6 p.m. and 7:15 p.m. respectively to receive final assurances that all will go smoothly, Spanish Prime Minister Pedro Sanchez lifted his threat of an effective veto after Britain and European Union officials provided written guarantees to Madrid.
May's spokeswoman told reporters earlier on Friday: "We've negotiated very openly and constructively with the European Union in matters relating to Gibraltar and worked closely with Spain".
And, as Madrid has noted, any final relationship negotiated between London and Brussels after Brexit day on March 29 would have to be approved by all remaining member states - giving Spain a de facto veto further down the line.
"If there's no agreement. there very probably won't be a European Council", he declared, referring to Sunday's summit of 27 EU leaders ahead of their encounter with May.
Meanwhile, Spain had threatened to pull out of the summit altogether until it was given assurances over Gibraltar, although the issue appeared to have been resolved on Saturday.
The withdrawal treaty itself is all but final, and preparations are under way for Sunday's summit to sign it, but there remains the matter of the parallel 20-page political declaration on future relations.