i think it's a false, unethical rationale. and people who feel that way should resign in principle the way elliott richardson did and joe lieberman does. the principal must believe they have the power to protect the country from trump. they don't. >> the book, rena, also makes pretty alarming new revelations about the steps that the president weighed in response to equal of the tensions with north korea. here's what it reports, one month in its presidency, trump asked dunford for a plan, for a preemptive military strike, and later says that the president raised the idea of tweeting that he would be withdrawing military dependence in south korea. we should point out that the president did not send that tweet. but what's your reaction to this? >> well, i want to go back to, again, 2015 when i was in rooms