The president-elect’s threat to hit Canada, Mexico and China with new tariffs is already rocking business and diplomatic relationships and could topple the trade pacts he signed in his first term.

Leaders in Mexico and Canada responded to the president-elect’s proposed new tariffs. Observers said the plan might just be the first step in negotiations.

Donald Trump's proposed tariffs could have major consequences for California's economy, which has a lot riding on trade, especially with China and Mexico.

The president-elect’s opening salvo in trade and border talks with the United States’ neighbors is casting a harsh light on the North American alliance.

With a Monday evening promise on Truth Social that his incoming administration will slap 25 percent tariffs on all goods from Canada and Mexico — as well as increasing already existing tariffs on China — Trump sent reporters (and investors,

U.S. oil and gas lobbying groups said on Tuesday they were wary of President-elect Donald Trump's threat of tariffs on Canada and Mexico, saying such policies could affect consumers, industry and security.