H.R. McMaster: A nuclear North Korea is ‘a grave danger to the world’

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Joining TODAY live, H.R. McMaster, President Trump’s current national security adviser, says that President Trump’s position on the Iran nuclear deal is part of a broader Iran strategy. He also warns that a nuclear-armed North Korea would be “a grave danger to the world.” He says he has not been contacted by special counsel Robert Mueller regarding the Russia investigation.