A government official says Canada is already examining possible retaliatory tariffs on certain items from the United States should President-elect Donald Trump follow through on his threat to impose sweeping tariffs on Canadian products.

Prime Minister Justin Trudeau and the premiers will meet Wednesday to discuss strategy as president-elect Donald Trump threatens to upend the bilateral relationship with punitive tariffs on everything Canada sends to the U.

Prime Minister Justin Trudeau on Tuesday said Canada must stay united against a threat by Donald Trump to impose tariffs but two major provinces quickly called on him to address the U.S. President-elect's concerns.