Support WBURAt Nuclear Summit, Many Leaders But No BreakthroughsPlay03:53Download AudioDavid WelnaApril 01, 2016 SharePresident Barack Obama, speaks during the opening plenary of the Nuclear Security Summit on April 1 in Washington, D.C. (Getty Images)
President Barack Obama, speaks during the opening plenary of the Nuclear Security Summit on April 1 in Washington, D.C. (Getty Images)