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.

Trump said his decision will be based on whether the price of oil charged by the two trading partners is fair, although the basis of his threatened tariffs pertains to stopping illegal immigration

President Trump on Thursday said he plans to follow through on Saturday on his threat to impose 25 percent tariffs on goods from Mexico and Canada. “We’ll be announcing the tariffs on Canada and Mexico for a number of reasons,