Record numbers of Syrians, Iraqis, and North Africans continue flooding into Europe. The European Union says more than 700,000 migrants have entered EU countries so far this year—more than twice as many as the total in 2014. The numbers have generated a massive humanitarian crisis.

Watch our conversation with Sean Callahan, chief operating officer of Catholic Relief Services, who is just back from the Balkans where thousands of migrants keep arriving every day.