>> welcome back. a new stare down with north korea's jkim jong un. kim jong un korea will be tested like never before. at least publicly he seems undeterred by the president's tough talk this week. a frightened dog barks louder of trump and a rare on camera statement. i will surely and definitely tame the u.s. deranged with fire. that fire north korea's foreign minster said could come in the form of a hydrogen bomb test. it they took that step, it would be the first above ground detonation since 1980. how would they respond if that