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,

An across-the-board 25 per cent tariff, experts says, would be devastating to the Canadian economy largely due to an anticipated knock-on decline in the value of the loonie.