Trump has repeatedly called April 2 “Liberation Day,” with promises to roll out a set of tariffs, or taxes on imports from other countries, that he says will free the U.S. from a reliance on foreign goods. To do this, Trump has said he'll impose “reciprocal” tariffs to match the duties that other countries charge on U.S. products.

Canadian Prime Minister Mark Carney told President Donald Trump Wednesday that his nation will retaliate against the United States with tariffs of its own if Trump presses forward with his promised levies – potentially escalating what is already developing into an ugly and damaging trade war.