After talking to EU officials in Brussels on Saturday, Prime Minister Theresa May confronts the critical summit of 27 remaining EU leaders on Sunday to seek their endorsement for the long-negotiated Brexit deal. At home, she is fighting opponents in parliament and her own party, and, in Brussels, Spain may opt out over Gibraltar and France over disputed fishing rights. The 585-page documents before them cover the terms of Britain’s exit from the Union on March 29 and a transition period up until December 2020. It also has a “backstop” measure, which says, that if the new UK-EU relationship is not finally negotiated by the end of the transition period, the customs union will remain in place. DEBKAfile: May and her government are on a cliff-edge for their survival since 85 members of her Conservative party have said they would vote against the deal.