i know that a measure of success may take longer than i'd like, may take longer than you'd like, but there will be success in the end one way or the other. >> joining me now, jordan chang, author of a book tonaek taknort korea takes on the world. do you agree that all will be fine? >> there is very little margin of area. we have maybe 12, 18 months before the north koreans can position a nuke to reach the lower 48. and then the policy make community will have to make a decision whether we can deter north korea. so this is an existential issue. and i hope it works out, but it will need a lot of good diplomacy on the part of the trump administration. and as we've seen over the prior administrations, they have made