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.

Oil prices slipped for a second day on Thursday after U.S. crude stockpiles rose more than expected, though attention remained on tariffs threatened by U.S. President Donald Trump on Mexico and Canada,

General Motors, the largest producer of cars in Mexico, won’t provide details on how it would react if President Trump imposes 25 percent tariffs from the two countries.