President-elect Donald J. Trump said on Monday that he would impose tariffs on all products coming into the United States from Canada, Mexico and China on his first day in office, a move that would scramble global supply chains and impose heavy costs on companies that rely on doing business with some of the world’s largest economies.
In a post on Truth Social, Mr. Trump mentioned a caravan of migrants making its way to the United States from Mexico, and said he would use an executive order to levy a 25 percent tariff on goods from Canada and Mexico until drugs and migrants stopped coming over the border.
