Disarmament Expert on N. Korea Summit: An International Process Is Needed to Reduce Nuclear Threat

President Trump is meeting with North Korean leader Kim Jong-un today in Vietnam in their second summit to discuss denuclearization of the Korean Peninsula. We speak with physicist, nuclear expert and disarmament activist Zia Mian. He is co-director of the Program on Science and Global Security at the Woodrow Wilson School of Public and International Affairs, Princeton University. He is the co-author of "Unmaking the Bomb: A Fissile Material Approach to Nuclear Disarmament and Nonproliferation."