WASHINGTON, D.C. - APRIL 01: (AFP OUT) (L-R) Dutch prime minister Mark Rutte, China's president Xi Jinping and Armenia's president Serzh Sargsyan stand 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, U.S. President Barack 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)
