President-elect Donald Trump said Monday that his incoming administration would slap new tariffs on imported goods from Mexico, Canada and China, solidifying a key campaign promise that could have a major impact on trade.

The president-elect said that he would impose the across-the-board tariffs on Day 1 and that they would stay in place until Canada, Mexico and China halted the flow of drugs and migrants.

President-elect Donald Trump on Monday promised massive hikes in tariffs on goods coming from Mexico, Canada and China starting on the first day of his administration, a policy that could sharply increase costs for American businesses and consumers.