>> and worth noting that there is an exception to -- for searches that take place at points of entry. you don't need a warrant or probable cause for those searches. >> i think that's right, a ali, but i think they got one here. which is that a court did fine out of a surefit of caution, the court did find one. >> david, thank you both very much. all right, coming up, trump is now calling for more tariffs on china tonight. $100 billion worth, as the tit for tat continues markets are already responding. are we headed for -- are we in a full-on trade war? former u.s. ambassador to china joins me after this quick break.