"Those who want to have free access to our internal market, they have to implement the four freedoms without exception and without nuances", Juncker said.
BRUSSELS (AP) - EU leaders are meeting Wednesday without Britain for the first time to rethink their union and keep it from disintegrating after Britain's unprecedented vote to leave - but conflicting visions of Europe's future are complicating the high-stakes summit.
Nearly every economist who tried to quantify the possible effect of Brexit concluded that leaving the single market would be hugely damaging to the British economy in the long run.
Meanwhile, both main political parties in Britain are in turmoil with the opposition Labour leader Jeremy Corbyn refusing to resign despite a crushing no-confidence vote.
Mr Cameron's successor as Downing Street is not expected to be invited. "It's not in the national interest, and I would say, for heaven's sake man, go".
One of the candidates to succeed Cameron, Stephen Crabb, said securing control of immigration was essential and acknowledged that might mean less access to the European Union market. "They are a place that is continually supporting the kind of initiatives internationally that we support", he said. The remaining presidents, chancellors and prime ministers showed a firm common resolve, committing to be "absolutely determined to remain united", EU Council President Donald Tusk said.
Other EU countries are now facing calls, especially from the far right, for referendums on quitting the bloc.
Scotland's First Minister Nicola Sturgeon met Wednesday in Brussels with European Parliament President Martin Schulz and is meeting later with the leader of the EU executive, Commission President Jean-Claude Juncker.
But EU officials have stressed, as they did before Scots voted against independence in a referendum in 2014, that Scotland could not apply to, let alone join, the Union until it had become a sovereign state.
The divorce itself is shaping up as a messy undertaking, with Europe and Britain at loggerheads on how to even begin the complicated disentanglement after more than four decades together. But please, remember this", he told the room full of European representatives and leaders, "remember this: Scotland did not let you down. Cameron wants time for his successor to formulate a strategy and sound out European colleagues before beginning the countdown.
London and Brussels will negotiate on how to deal with the vote and the decision to trigger a British exit may only be made by "next cabinet" and "next prime minister", he said.
She said, "I see North Atlantic Treaty Organisation now as unfortunately the only truly Atlanticist institution, but I don't think it will have an effect on North Atlantic Treaty Organisation".
"I'd say give them some leeway", said Dutch Prime Minister Mark Rutte.
But at this critical juncture in its history, Britain is looking effectively leaderless.
The shock British vote has roiled markets and had an impact on Europe and beyond.
Beyond the immediate economic impacts and the potential loss of European Union funding - which now supplies some 16% of United Kingdom university research money - scientists fear a loss of mobility between the country and the continent. "I would not overstate it", he said in response to a question.