TORONTO — Roughly $900 billion in annual trade between Canada and the United States — and, with it, traditionally chummy bilateral ties — is on the brink of upheaval, with President Donald Trump threatening to impose sweeping tariffs on Canada as early as this weekend.

Hydropower and pipelines cross the U.S.-Canada border. They’re critical to keeping the lights on and energy costs from going up.

The U.S. border czar is set to meet Canadas top public safety official on Friday, just hours before President Donald Trump decides whether to impose 25% tariffs on Canada and Mexico. The meeting offers Canada a

The scale at which Donald Trump’s agenda and musings have reshaped politics in Canada is, as the president himself might put it, huge. The US president has turned the Canadian political landscape into a circus,