tariffs on steel and aluminum sparking fears of a global standoff. he started out tossing nafta in the mix as a bargaining tool. the tariff threat going against the counsel of his advisors, sending jitters through stock markets and republican die hard. with me now, larry somers of the economic council under president obama and former treasury secretary under president clinton. a pleasure to have you. welcome, sir. >> good to be with you, brooke. >> trade wars. you know, last week the president said they were a good thing. he's now saying don't worry about it. with your years of experience, i want you to finish my sentence. trade wars are -- >> trade wars are terrible. what presidents have said before is that nuclear wars can never be won and must never be fought. that's the right strategy for trade wars. to try to initiate a trade war