Support WBURAs U.S. Flexes Its Muscles On Trade, Other Countries Are Beginning To Push BackPlay03:37Download AudioJim ZarroliJune 08, 2018 SharePresident Trump is greeted by Canadian Prime Minister Justin Trudeau at the official welcome of a G-7 summit Friday in Quebec. The summit comes as the U.S. is clashing with Canada and other big trading partners over tariffs. (Getty Images)