BRUSSELS, Nov 25 - EU leaders urged Britons to back Prime Minister Theresa May's Brexit package as they gathered on Sunday to formally agree a deal with her that faces furious opposition in the British parliament.
"Now it is time for everybody to take responsibility -- everybody," said Michel Barnier, the Frenchman who has ground out the withdrawal treaty over the past 18 months as national leaders gathered for a brief morning of summitry in Brussels.
His boss, European Commission President Jean-Claude Juncker, told reporters that Brexit was a "tragedy" and tough on both sides but said he was confident the British parliament would accept the package on offer. Asked if the EU could improve the terms if not, he said its fundamental positions would not alter.
Barnier described the 600-page treaty setting terms for Britain's withdrawal from the European Union on March 29 as a good base to negotiate a future relationship, a 26-page outline of which the leaders will also agree with May. But he insisted to reporters: "We will remain allies, partners and friends."
Dutch Prime Minister Mark Rutte, whose country is one of Britain's closest trading partners, praised May's handling of the difficult negotiations and said he was confident that she could see the deal through parliament in the coming weeks.
But he also had a warning for those in May's Conservative party as well as the Labour opposition who argue that a better deal can still be done before Britain leaves in four months if lawmakers deny her minority government support on Brexit.
"This is the max we can all do," Rutte said, shaking his head when asked if the EU might make more concessions.
Saying the EU "hates" Brexit, Rutte said: "Nobody's winning -- we are all losing." But, he said, the deal was an acceptable compromise for all that gave May a chance to clinch a solution.
The biggest question now facing the European Union is whether May's divided minority government can steer the deal, which foresees London following many EU rules to keep easy trade access, through fierce resistance in parliament in the coming weeks from both supporters and opponents of Brexit.
Lithuanian President Dalia Grybauskaite said there were at least four possible outcomes if parliament blocks the package. She named three - that Britons would hold a second referendum, hold a new election to replace May or return to Brussels to try and renegotiate the package. A fourth is that Britain will simply crash out of the bloc on March 29 without legal clarity.
Both sides have been making preparations for such a "no deal" scenario, though the EU insists Britain has more to lose. The pound has strengthened since the deal came together over the past 10 days, but companies and investors remain nervous.
Summit chair Donald Tusk said "no one will have reasons to be happy" when Brexit is concluded but quoted British rock star Freddie Mercury of Queen, who died 27 years ago on Saturday, to say: "Friends will be friends right till the end."
The 27 EU national leaders will gather for an hour or so to formally endorse the package, which foresees little changing during a transition period lasting another two to four years.
They will then meet May briefly as she seeks momentum to get the package through the British parliament in the coming weeks.
The Democratic Unionist Party, whose votes from Northern Ireland have helped May to govern since she lost her majority in a misjudged snap election last year, said it would try to block a Brexit deal it called "pitiful" - partly because it binds London to many EU rules it will no longer help set and partly as the DUP fears it could weaken the province's ties to Britain.
No one knows what will happen if parliament rejects May's plan, which she and EU leaders say is the best deal available.
In an open letter to the nation, published on Sunday, May said she would campaign "heart and soul" to get her Brexit deal through: "It will be a deal that is in our national interest – one that works for our whole country and all of our people, whether you voted Leave or Remain," she said.
Sunday newspapers said different factions in her own Conservative party were preparing alternative plans to keep Britain closer to the EU should her deal fail as many expect.
Wrangling over how to keep open troubled Northern Ireland's land border with the EU without creating disruptive customs barriers with the Irish Republic dogged much of the 18 months of talks before accords were struck this month. Another relic of the imperial past, Britain's 300-year-old naval base on Spain's southern coast, threatened to derail plans at the last minute.
Spanish Prime Minister Pedro Sanchez threatened to boycott Sunday's meeting if he did not get amendments to the deal to ensure Madrid gets a say in Gibraltar's future ties with the EU.
After officials wrangled through the night, he announced on Saturday afternoon that he had such written pledges. Brussels officials said those essentially confirmed what most EU leaders had already understood - that Spain must have a binding say over how any future EU-UK trade pact might affect Gibraltar.
May will meet Sanchez for face-to-face talks during the summit, officials said.
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