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BRUSSELS, BELGIUM - MARCH 07: European council president, Donald Tusk and Turkish Prime Minister Ahmet Davutoglu share a joke during the family photo call at The European Council Meeting In Brussels held at the Justus Lipsius Building on March 7, 2016 in Brussels, Belgium. EU leaders are meeting with Turkish Prime Minister Ahmet Davutoglu in Brussels, to discuss the worst refugee crisis since the Second World War, as thousands of migrants remain stranded in Greece after borders along the Balkan route to Germany are closed. (Photo by Dean Mouhtaropoulos/Getty Images)

BRUSSELS, BELGIUM - MARCH 07:  European council president, Donald Tusk and Turkish Prime Minister Ahmet Davutoglu share a joke during the family photo call at The European Council Meeting In Brussels held at the Justus Lipsius Building on March 7, 2016 in Brussels, Belgium.  EU leaders are meeting with Turkish Prime Minister Ahmet Davutoglu in Brussels, to discuss the worst refugee crisis since the Second World War, as thousands of migrants remain stranded in Greece after borders along the Balkan route to Germany are closed.  (Photo by Dean Mouhtaropoulos/Getty Images)