President of the European Council Donald Tusk has confirmed all EU leaders have reached an agreement with Turkey's prime minister to curb the migration crisis.
The new arrangements could come into force as soon as Sunday after a revised deal was reached between Turkish PM Ahmet Davutoglu and European Council president Donald Tusk in Brussels.
Turkish prime minister Ahmet Davutoglu has said that "the whole future" of Europe is on the table as he arrived for an emergency summit in Brussels to discuss Turkey's part in stemming the migrant crisis.
Speaking to reporters ahead of negotiations, he said how "indispensable the EU is for Turkey and Turkey for the EU."
He said that the way to respond to the EU migrant crisis "is with solidarity ... we have to see the whole picture, not just irregular migration."
The agreement involves closing the EU border on March 20 and sending back migrants who arrive in Greece after that date to Turkey.
Cameron asks EU leaders to back deployment of more international patrol ships close to Libyan coast in bid to deter migrant smugglers.
David Cameron will tell his European colleagues that the migration route from Libya to southern Italy is about to begin once more.