Trump knows the United States has more leverage over its neighbors than they do over his country. But exploiting that position of strength could cause a historic rupture.

Experts say the 1977 International Emergency Economic Powers Act is untested for imposing import tariffs and Trump's action will likely face swift court challenges that could set important precedents.

Donald Trump famously renegotiated an existing trade pact with the countries in his first term. Now he's going back for more.

Canada and Mexico vowed to hit back at the US after President Donald Trump followed through on threats to impose 25% tariffs on imports of their goods, instigating a trade war that’s set to reshape global supply chains.