Nov 25 (Reuters) - U.S. President-elect Donald Trump said on Monday he would sign an executive order imposing a 25% tariff on all products coming in to the United States from Mexico and Canada.

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.

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.