Theresa May has secured new "legally binding" assurances on the Irish border backstop following hours of talks in Strasbourg with EU leaders.
The Prime Minister held discussions with EU Commission president Jean-Claude Juncker, who warned: "this is the deal... or Brexit may not happen at all".
Speaking at a joint press conference, Mr Juncker said "we left no stone unturned" as he and Mrs May met for last-ditch talks in a bid to secure a compromise.
Mrs May urged MPs to back her new "improved" deal in the meaningful vote on Tuesday, with Mr Juncker warning that if the deal was voted down there would be "no third chance".
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