Trump's threats to put tariffs on imports from Canada and Mexico have weighed on markets, even though there has been considerable uncertainty over whether he would make good on his threat.

The U.S. imposed 25% tariffs on Mexico and Canada early Tuesday morning, along with imposing an additional 10% tariffs on Chinese imports. The 25% tariffs will apply to all imports from Mexico and Canada,

U.S. President Donald Trump announced 25% tariffs on imports from Mexico and Canada, effective Tuesday, sparking fears of a North American trade war. The move sent U.S. stocks tumbling, with the Dow falling 649.