President Trump said Thursday he was cutting off trade negotiations with Canada, citing an ad campaign that used former President Ronald Reagan’s warnings about the long-term risks of tariffs amid the trade dispute between the U.S. and Canada.

Trump in a post on Truth Social accused Canada of using the ad to “interfere” with a pending Supreme Court case to determine Trump’s authority to impose sweeping tariffs on other countries.

“Tariffs are very important to the national security, and economy, of the U.S.A. Based on their egregious behavior, ALL TRADE NEGOTIATIONS WITH CANADA ARE HEREBY TERMINATED,” Trump posted.

Ontario Premier Doug Ford, who has clashed with Trump repeatedly, announced the ad campaign earlier this month. The ad features a clip of a 1987 address by Reagan in which he

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