How the next president must deal with North Korea

North Korea now says it is ready to respond to U.S. Military exercises. This comes after North Korea conducted its fifth and most powerful nuclear weapons test. Co-chairs of the Council on Foreign Relations-Sponsored Independent Task Force on U.S. Policy toward North Korea, Admiral Michael Mullen and former Senator Sam Nunn, join NBC’s Andrea Mitchell to discuss how the next President needs to address North Korea.Sept. 16, 2016