UK lawmakers have indicated they could support a deal which either removes or modifies the so-called Irish backstop, the legal mechanism that could hold the United Kingdom inside the Common Market and European Union laws against its will for years after Brexit is officially completed.
Varadkar has said he has already alerted the European Commission that he will seek emergency aid for companies if Britain leaves without a deal next month, alongside other potential EU aid and domestic sources of emergency funding, should bored issues arise.
"They will give you awful trouble in the British press", Varadkar appeared to say to Tusk as they shook hands after their comments to the press. At the moment the pro-Brexit stance of the United Kingdom prime minister and the leader of the opposition rules out this question, today there is no political force and no effective leadership to remain.
"Clearly the pressure is beginning to mount in Brussels, we've seen that today from some of the response particularly from the President Donald Tusk", she said.
He said he no longer believed there was a way to stop Britain leaving due to the "pro-Brexit stance" of both the prime minister and the leader of the opposition.
At meetings in Belfast, Mrs May tried to tackle the biggest obstacle to getting a deal ratified by the British parliament - an insurance policy covering the possible future arrangements for the border between EU-member Ireland and the British province of Northern Ireland.
"Give us a believable guarantee for peace in Northern Ireland, and the United Kingdom will leave the European Union as a trusted friend", Tusk said.
She told an audience of business leaders and journalists that she wanted to "affirm my commitment to delivering a Brexit that ensures no return to a hard border between Northern Ireland and Ireland, which is unshakeable".
For weeks, they have been begging May to tell them - exactly - what she wants amended in the withdrawal agreement, so that it can pass her divided House of Commons.
"They are people who have acted with absolute contempt for this country, utter disregard for the experiences of Irish people north and south, with utter disregard for the peace process that has been collectively built over decades", McDonald said.
He added: "The EU is first and foremost a peace project", he said.
Mr Tusk could be heard replying: "Yes, I know", before the Irish PM responded: "But I know you're right".
He said that in light of ongoing uncertainty in the UK, EU leaders have agreed that no-deal preparation must continue and intensify.