Andrea Mitchell Reports 03/31/16

Energy Secy. on Summit and Trump’s nuclear comments

President Barack Obama is joined by leaders from 50 other nations in Washington, D.C. for the Nuclear Security Summit which is focusing on the threat from North Korea. Secretary Ernest Moniz from the U.S. Department of Energy joins Andrea Mitchell to discuss the event and Donald Trump’s comments on nuclear weapons against ISIS. ... more Duration: {{video.duration.momentjs}}