‘Poorly informed, incoherent’: Arms expert on Trump’s order to test nuclear weapons

President Trump has directed the Pentagon to start testing nuclear weapons “on an equal basis” with other countries. MSNBC Senior White House Reporter Vaughn Hillyard has the details on the order. Executive Director of the Arms Control Association Daryl Kimball joins Chris Jansing with more insight on the risk, saying it would “open the door for other countries” to do the same.