EU leaders have challenged MPs to either back Theresa May’s Brexit deal or face up to the economic consequences of crashing out of the bloc.
Heads of its 27 member states took little more than half an hour this morning to rubber-stamp the agreement setting the terms for Britain's departure.
However, the deal now faces a vote in the House of Commons, where the odds appear stacked against it as MPs of all stripes, including a significant portion of the prime minister’s own party, have made their opposition clear.
Mr Varadkar said he was pleased to be in Brussels to sign off on the deal, which he said represented the culmination of nearly two years of work.
He said:
It was a very difficult deal to negotiate
I anticipate that in the next couple of hours that agreement will get the assent of the 28 governments, 27 member states that are staying and also the government of the UK and that will allow us to move on
This is the deal. It's the best deal possible and the EU will not change its fundamental position when it comes to these issues.
"The best outcome for Ireland, and I think for Europe and Britain, would be for the UK to stay in the European Union, to stay in the single market and customs union, but we respect their decision not to do that."

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The Independent European leaders were poised to approve the prime minister's Brexit blueprint at a special summitIt's for MPs now, of course, to scrutinise this properly but if that does not happen then, effectively, you will be back to square one with more uncertainty, more division.
"It is important for people to get behind the Prime Minister, get behind the deal that we see being approved today, allowing us to move forward as a country on to all of those things that the British people want us to do, all of the domestic priorities.
I don't want to contemplate the no-vote, I think there will be a yes vote. But more in general, I think this is the max we can all do. Both Theresa May and her government, as well as the European Union.(There are) no victors here today, nobody winning. We are all losing. But given that context this is acceptable.
European Commission president Jean-Claude Juncker has warned Britain cannot expect to get a better deal if Parliament rejects the agreement hammered out by Theresa May.
"This is the deal. It's the best deal possible and the EU will not change its fundamental position when it comes to these issues," he said.
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Jean-Claude Juncker, the president of the European Commission, warned them the agreement was the “only deal possible” and hopes that a better one could be struck were in vain.
“Those who think by rejecting the deal that they would have a better deal will be disappointed in the first seconds after the rejection of this deal,” he said.
In a veiled plea to MPs Michel Barnier, Europe’s chief negotiator, called on “everyone to face up to their responsibilities”.
Mr Barnier said the deal with the UK was a "necessary step" to advance to the next phase of the negotiations.
"I have worked with my team and negotiated with the UK, never against the UK," he told reporters as he arrived for the summit.
"Now it is time for everybody to take their responsibility. This deal is a necessary step to build the trust between the UK and the EU we need to build.
"The next phase is an unprecedented and ambitious partnership. We will remain allies, partners and friends."
Ms May has written a letter to the British public pleading for the country’s support over the deal.
In her letter she promised a “brighter future” and said that Brexit would be "a moment of renewal and reconciliation for our whole country".
The Independent has launched its #FinalSay campaign to demand that voters are given a voice on the final Brexit deal.
Sign our petition here