london presumptive u.s. republican presidential nominee donald trump say britain leave european union would make difference potential bilateral trade deal become president accord interview clip air broadcaster itv sunday visit london last month president barack obama tell britons elect leave eu june 23 referendum would back queue u.s. trade deal go treat everybody fairly make difference whether eu trump say interview piers morgan due air full itv monday would certainly back queue tell you trump say brexit would n't impact potential uk-u.s. trade deal president itv