another round of tit for tat. the dow plunged more than 700 points during the day closing down 623. before leaving the white house the president said he was simply cleaning up the mess left by previous administrations. >> china has been hurting our country for 30 years with the money they have been taking out. other presidents should have done something about it and should have done something about it a long time ago. clinton, bush, obama. they should have done something about it. i am doing it. i have no choice. we are not going to lose close to a trillion dollars a year. they understand we are not going to do it. this is more important than anything else right now just about that we are working on. >> steven is covering the trade