the biggest security threats in the world. north korea's nuclear arsenal. president trump and kim met for the first time last june. the first summit between a u.s. president and north korean leader. the leaders didn't spell out how pyongyang will denuclearize but the president says he is not in a rush since the north has stopped testing weapons. john roberts reporting live in hanoi, vietnam. >> good afternoon to you. good morning from hanoi. is kim jong-un willing to give up his nuclear program and is there something that president trump can do between tomorrow and the day after to convince him to do it? you mentioned the summit in singapore last june. the first meeting between a u.s. president and north korean leader. at that summit kim jong-un pledged that he was going to