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The bubbling trade war between the United States and Canada continues to escalate as U.S. President Donald Trump announced a new round of tariffs Monday.

Trump said in a social media post that he would install a 50% tariff on all cars, trucks, automotive parts and steel imports from Canada, effective Jan. 1, claiming Canada was “ripping off” the U.S.

It’s unclear how the threatened tariffs would interact with existing Section 232 levies on imported automobiles and parts, or with the existing United States-Canada-Mexico Agreement, as the White House has yet to publish an official tariff order beyond the social media post.

The latest salvo from Trump comes after last week’s breakdown of trade negotiations over separate 50% tariffs the president threatened more than a month ago. Trump initially ordered the duties to go into effect Wednesday, but he delayed them by three days as the two countries worked to hammer out a deal to avert the levies.