President Obama Participates In The Nuclear Security Summit

WASHINGTON, D.C. - APRIL 01: (AFP OUT) U.S. President Barack Obama (C) waves among other heads of state and attendees during a family photo at the Nuclear Security Summit on April 1, 2016 in Washington, D.C., U.S. After a spate of terrorist attacks from Europe to Africa, Obama is rallying international support during the summit for an effort to keep Islamic State and similar groups from obtaining nuclear material and other weapons of mass destruction. (Photo by Andrew Harrer-Pool/Getty Images)