WASHINGTON, DC - MARCH 31: (AFP OUT) U.S. President Barack Obama talks to Prime Minister Narendra Modi of India as President Xi Jinping of the People's Republic of China looks on at the Nuclear Security Summit March 31, 2016 in Washington, DC. World leaders are gathering for a two-day conference that will address a range of issues including ongoing efforts to prevent terrorist groups from accessing nuclear material. (Photo by Dennis Brack - Pool/Getty Images)
