washington u.s. senate committee tuesday hold first congressional hear four decades president authority launch nuclear strike amid concern tensions north korea weapons program could lead war senator bob corker republican chairman senate foreign relations committee hold hear president donald trump wrap 12-day trip asia largely dominate concern pyongyang nuclear ambition corker acknowledge senators include democrats trump fellow republicans raise question trump authority wage war use nuclear weapons enter end international agreements trump trade insult threats north korean leader kim jong un use expressions like fire fury hint use lethal force north korea would overwhelm sunday insult kim call short fat corker warn last month trump might put unite state path world war three tuesday corker say hear intend target trump specific anybody say democrats make clear concern trump concern president unite state unstable volatile decision-making process quixotic might order nuclear weapons strike wildly step u.s. national security interest senator chris murphy say hear retire general robert kehler former commander u.s. strategic command say military refuse follow consider illegal order even nuclear one clear question committee members process would work senators want legislation alter president nuclear authority corker say support idea see legislative solution today mean course next several months one might develop tell reporters hear senators seem bristle hear tone warn comment depict trump unable strongly retaliate attack every single word utter morning hear go analyze pyongyang say republican senator jim risch line become chairman corker retire next year senate committee question trump 's nuclear authority