Cox´s presence is seen as central as he will ultimately offer a legal opinion on the Brexit deal and the Irish backstop that could determine whether key pro-Brexit lawmakers will approve the withdrawal agreement.
Lengthy talks this week ended with the sides still far apart over how to resolve the impasse over the future status of the Irish backstop. "Both sides want to find a way through this and we're hoping for that success to happen this weekend in time for the vote".
Brussels has insisted it is up to Britain to come up with new ideas by the end of Friday to break the deadlock, but Mrs May will say that "the European Union has to make a choice too". It is in the European interest for the United Kingdom to leave with a deal.
Britain's Prime Minister Theresa May during the weekly Prime Minister's Questions in the House of Commons in London March 6, 2019.
"The political establishment comprised of the Conservative party and the Labour party are now working all out to overturn the referendum, either to keep us in the European Union or make sure we can join again after a short period of Mrs May's "not really leaving" agreement ..."
If she is defeated again, she has committed to giving MPs subsequent votes on whether the United Kingdom can leave without a deal and whether Britain's departure, scheduled for 29 March, should be delayed.
Shadow Brexit secretary Sir Keir Starmer said: "It's becoming increasingly clear that Theresa May will not be able to deliver the changes she promised to her failed Brexit deal".More news: Mufti Abdul Raoof, Hamad Azhar among 44 taken into preventive detention
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"The Government will set out what it believes to be the correct tariffs if indeed we get to a no-deal scenario", he said.
Barnier said the discussions have nonetheless taken place in a "constructive atmosphere", speaking the day after he held the latest round of talks with United Kingdom attorney general Geoffrey Cox and Brexit minister Stephen Barclay.
In practical terms the Government needs an agreement by Sunday night at the latest as any new documentation relating to the deal must be published by Monday - the day before the vote. If lawmakers reject it again as they did in January, they must then choose between departing the European Union without a deal or postponing the exit altogether.
Cox rejected criticism that Britain had not presented viable plans to the European Union, telling MPs the proposals were "detailed, coherent, careful" and "as clear as day".
Delaying Brexit would require approval from all 27 remaining member states.
Rejecting the notion that Lord Trimble is qualified to speak for the North's Catholics, Fermanagh priest Fr McVeigh said Brexit has "accelerated" discussions about unity, even among unionists, and Prof.
Hammond expects Parliament to postpone Britain's departure until a deal is done.