President-elect Donald Trump is threatening to impose sweeping new tariffs on Mexico, Canada and China as soon as he takes office as part of his efforts to crack down on illegal immigration and drugs.

Mexico and Canada are the United States’ top two trading partners, accounting for nearly 30% of trade volumes.

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