the commander in chief is tweeting about nuclear war. mike gerson wrote something tonight, the title is "republicans, it's time to panic." he writes, the problem has always been trump's fundamental unfitness for high office. it is not his vulgarity and smallness. it is not his nearly complete ignorance of policy and history which condemns him to live in the eternal present of his own immediate desires. no. corker has given public permission to raise the most serious questions. is trump psychologically and morally equipped to be president and could his unfitness cause permanent damage to the country. isn't this the conversation that the president is desperate for us not to be having right now? >> it's one of them, yes, i mean, it is. and yet, even though bob corker went out and said that, very few