WASHINGTON (AP) — President Donald Trump on Thursday threatened Canada with a 50% tariff on any aircraft sold in the U.S., the latest salvo in his trade war with America’s northern neighbor as his feud with Prime Minister Mark Carney expands.

Trump’s threat posted on social media came after he threatened over the weekend to impose a 100% tariff on goods imported from Canada if it went forward with a planned trade deal with China. But Trump’s threat did not come with any details about when he would impose the import taxes, as Canada had already struck a deal.

In Trump’s latest threat, the Republican president said he was retaliating against Canada for refusing to certify jets from Savannah, Georgia-based Gulfstream Aerospace.

Trump said the U.S., in return, would decertify all Canadian aircraft, including planes from its largest aircraft maker, Bombardier. “If, for any reason, this situation is not immediately corrected, I am going to charge Canada a 50% Tariff on any and all Aircraft sold into the United States of America,” Trump said in his post.

Spokespeople for Bombardier and Canada’s transport minister didn’t immediately respond to messages seeking comment Thursday evening.

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Associated Press writer Rob Gillies in Toronto contributed to this report.