and they do that. they'll figure out the problems. the question is not if they can build an icbm. it's when. secretary kelly is right. hen they mate a nuclear warhead to an icbm, they pose a real threat. i hate to talk about red lines, but that become a red line for the united states. >> what do we know about the fate, the wherewithal of this american professor who was arrested just before taking off from pyongyang airport? >> well, we understand from the university in pyongyang the pyongyang university of science and technology where he was a professor, a man is in his late 40s. his name is kim song duck. he goes by the name of tony kim. he was working on aid and relief programs. detained the at the airport while he was trying to leave the country. and the swedish embassy there,