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VALLETTA, MALTA - NOVEMBER 11: Prime Minister of Greece Alexis Tsipras arrives for the first session of the Valletta Summit on migration on November 11, 2015 in Valletta, Malta. The Summit will bring together representatives from the European Union and Africa to address the challenges and opportunities presented by the largest migration of people to Europe since World War II. (Photo by Ben Pruchnie/Getty Images)

VALLETTA, MALTA - NOVEMBER 11: Prime Minister of Greece Alexis Tsipras arrives for the first session of the Valletta Summit on migration on November 11, 2015 in Valletta, Malta. The Summit will bring together representatives from the European Union and Africa to address the challenges and opportunities presented by the largest migration of people to Europe since World War II.  (Photo by Ben Pruchnie/Getty Images)