David Cameron, who is a professor of political science and the director of the Yale Program in European Union Studies, talks bout the refugee crisis in the European Union. Europe is facing an unprecedented humanitarian crisis. Day after day, thousands of refugees from Syria, Iraq and other conflicts have undertaken long and perilous journeys, both across the Mediterranean and through the Balkans in the hope of finding shelter and obtaining asylum in the European Union. Every day, we hear of one EU state after another instituting border controls, some quite drastic, to stop the flow of migrants. And day after day, we hear about disagreements among the members of the EU over how to respond to the crisis, including about how to share in the burden of receiving the migrants.