President Donald Trump said he would increase tariffs charged to the European Union for cars and trucks to 25%, without saying what authority he would use to raise the levies. "Based on the fact the European Union is not complying with our fully agreed to Trade Deal, next week I will be increasing Tariffs charged to the European Union for Cars and Trucks coming into the United States," he wrote on Truth Social on Friday. "The Tariff will be increased to 25%. It is fully understood and agreed that, if they produce Cars and Trucks in U.S.A. Plants, there will be NO TARIFF." The Supreme Court ruled in February that a large part of Trump's tariff agenda was illegal.…