The move, announced on social media, threatens America’s largest trading partners over alleged failure to deal with illegal immigrants 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.

After President-elect Donald Trump said he would enact steep tariffs on Mexico, Canada and China, those nations urged talks instead of damaging trade relationships. Meanwhile, economists fear tariffs could stoke inflation for U.