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.

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.

OTTAWA (Reuters) -The Bank of Canada said on Tuesday that if U.S. President-elect Donald Trump follows through on his threat of tariffs on Canada, it would have an impact on both economies and the central bank would incorporate those into its economic forecasts.