center. many republicans in this town, anderson, wish the president would talk about his agenda, wish the president would talk about things that have to happen in 2018, instead, it's about the -- the tweet we saw tonight. >> yeah. i want to reread that tweet. >> reporter: sure. >> jeff zeleny, thanks very much. i also want to bring in gordon chang author of "nuclear showdown: north korea takes on the world." "north korean leader kim jong-un stated the nuclear button is on the table at all times. will someone from his defleeted and food-starved regime inform him i, too, have a nuclear button, but it's a much bigger and more powerful one than his and my button works." gordon chang, what do you make of this? >> this makes sense on no level, first of all, it makes the president of the united states look like a juvenile. also with regard to north korea, whatever you think your policies should be, you should be talking about the policy and getting a coalition in the world. so, for instance, if he likes sanctions, which i happen to