President Donald Trump said late Thursday that he was terminating negotiations with Canada over the high tariffs that he imposed on its steel, auto parts and other major exports, adding new uncertainty to the relationship with America’s second-biggest trading partner.

On Truth Social, the president said he was ending all trade negotiations with Canada because of a video ad, paid for by the province of Ontario, that featured former President Ronald Reagan speaking negatively about tariffs.

“TARIFFS ARE VERY IMPORTANT TO THE NATIONAL SECURITY, AND ECONOMY, OF THE U.S.A.,” Trump wrote. “Based on their egregious behavior, ALL TRADE NEGOTIATIONS WITH CANADA ARE HEREBY TERMINATED.”

Trump claimed that the ad was fake and said that it had been placed “to interfere with the decision of the U.S.

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