jong-un's head, but he's a guy who is anxious about his own survival and he was just challenged by his international enemy, and so the idea that he's going to take -- i mean, it's a sort of a no-lose situation for him. he can respond and show he's a tough guy, too. i'm not sure that will be useful. or he can be the bigger man. can you imagine if kim jong-un, you know, responds to this with carefulness and prudence, how that makes the united states and the american president look? so in some ways it's a no-lose proposition for this young untested and off balance leader of north korea. >> congressman himes, appreciate your time. professor chang, if you would just stay with us. perspective next from david gergen and, no, this was not the only presidential tweet in the last few moments. there's more, when we come back. turn up your swagger game with one a day men's. a complete multivitamin with key nutrients plus b vitamins for heart health. your one a day is showing. save up to $8 on one a day. see sunday's paper.