Key takeaways and next steps after Trump/Kim summit

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President Trump is on his way home from Hanoi without a deal, after talks with Kim Jong Un abruptly broke down and the two leaders failed to agree on any steps toward the denuclearization of North Korea. Ambassador Nick Burns, former Ambassador to NATO and former Undersecretary of State for Political Affairs, and the former Director of the National Counterterrorism Center Michael Leiter join Andrea Mitchell to discuss.