This is sure to bring about shrieking from the left that Trump "wants war," and that under no circumstances should we even think about using weapons or the Armed Forces against Bowl Cut Jr.'s hermit torture paradise. That's been official U.S. policy for at least the past eight years, and de facto U.S. policy much longer than that, if only because of the presumption that the Norks either have nuclear weapons, or are awfully close to having them, and could turn Seoul into a sheet of glass if given enough of a provocation.
Would the U.S. actually attack North Korea? According to Secretary of State Rex Tillerson, you and they would not be wise to simply assume we wouldn't: