President Donald Trump said he would charge a 50% tariff on aircraft from Canada sold in the U.S. and decertify all planes made in that country until Ottawa agreed to approve certain jets made by Gulfstream Aerospace Corp., an American firm.

Trump said Canada had “wrongfully, illegally, and steadfastly refused to certify the Gulfstream 500, 600, 700, and 800 Jets,” in a social media post Thursday. In response, he said the U.S. would decertify “Bombardier Global Expresses, and all Aircraft made in Canada, until such time as Gulfstream, a Great American Company, is fully certified.”

Trump claimed that Canada was “effectively prohibiting the sale of Gulfstream products in Canada through this very same certification process.”

“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,” he added.

Trump’s move is the latest escalation of trade tensions with a major U.S. trading partner, including a recent threat to hit Canadian goods with a 100% tariff if the country made a trade deal with China.

Trump has bristled at comments from Canadian Prime Minister Mark Carney at the World Economic Forum in Davos that offered an implicit denunciation of Trump’s approach to economic and foreign policy and after Canada and China agreed to a modest pact that essentially swapped canola sales to China for a quota of electric vehicle sales to Canada.

The two leaders spoke earlier this week, with Carney standing by his comments at Davos and seeking to explain Canada’s push to diversify its trade with other nations.

The back-and-forth comes as the countries prepare to renegotiate their continental trade pact, known as USMCA, which Trump agreed to in his first term. Trump is not applying tariffs to most goods traded under USMCA, with some exceptions, including the auto sector. That means a large proportion of Canadian exports are entering the U.S. duty-free, though significant tariffs remain on key sectors, like steel and aluminum.

Earlier Thursday, Trump threatened to tariff countries that provided or sold oil to Cuba, in a move that could subject Mexico to higher levies.

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