Tusk said when British friends asked him if he could imagine a way for Britain to remain part of the bloc, he told them "the European Union was built on dreams that seemed impossible to achieve".
"I told them that in fact the European Union was built on dreams that seemed impossible to achieve", he said, before turning to the late Beatle to clarify.
Mr Tusk said the bloc was calling on social media companies to do whatever was necessary to prevent the spread of terrorist material and was prepared to pass new legislation.
Quoting John Lennon's Imagine, he said: "You may say I'm a dreamer, but I'm not the only one".
Hammond's more frequent and pointed interventions in the Brexit debate have come amid mounting evidence that the economic situation in Britain has worsened just as it has gotten brighter for the rest of the EU.
"As we know, the Brexit negotiations started three days ago".
The discussions between U.K. Brexit Secretary David Davis and Barnier marked the end of the beginning of what both sides expect to be a complicated and confrontational process to unwind more than four decades of membership.
Barnier, following the talks in a joint press conference with Davis, said: "Today we agreed on dates".
Trump's repeated criticism of North Atlantic Treaty Organisation allies, 22 of whom are EU members, for being too reliant on the United States' military, has also unnerved European leaders, who say they must do more together and see defense as a unifying force after Brexit.
Speculation that a leadership challenge to Mrs May is possible raises questions about her authority and the certainty of the sort of Brexit she is proposing.
Billionaire Moshiri to spearhead Everton’s Italian job
Indeed, it is only by virtue of Falcinelli’s prowess in the final third that Crotone still remains in contention to survive. In Romelu Lukaku, Koeman has a player with the capability of firing Everton to far headier heights than seventh place.
Merkel welcomed the presence of French President Emmanuel Macron, who was attending his first European Union summit after winning elections May 7.
French President Emmanuel Macron said last week that the door is still open for Britain to remain. "I will do all I can to put emotion to one side", Barnier said.
"But from the moment things are engaged with a timescale and an objective, it's very hard to go back, we can't lie to ourselves".
May, bruised by an election this month that cost her Conservatives their parliamentary majority, will make her case for a quick agreement on residency for EU nationals and employment rights at a summit of European leaders in the Belgian capital later this week.
"My mandate is to defend the single market, defend the European Union, which the United Kingdom has made a decision to leave", Barnier told reporters after briefing ministers from EU member states in Luxembourg. Recalling his own past as a dissident who saw Soviet communism collapse, he told reporters: "Miracles do happen".
"As our largest single trading partner, we have a strong foundation to build on as we start preparation on joint work to explore a future ambitious trade agreement once the United Kingdom has left the European Union".
German chancellor Angela Merkel said building a future for the remaining 27 European Union member states took priority over negotiations with the UK.
"Naturally we will conduct these negotiations quickly and we will conduct them intensively. We will do everything to ensure that - as has been successfully done so far - the 27 states stick together".
"We want this negotiation to take place in a good spirit". She made it clear that Britain wants reciprocal measures for the 1.5 million British citizens living in the EU.
At the same time, Tusk insisted that the remaining 27 members had a renewed sense of optimism about the bloc's future after years of crisis and mounting anti-EU sentiment, which culminated in the Brexit vote.
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