President Trump says he is ending all trade negotiations with Canada over an ad campaign featuring a clip of former President Ronald Reagan denouncing tariffs.

Trump claims the ad is designed to sway the forthcoming U.S. Supreme Court arguments over his sweeping taxes on imports, although it’s not clear how it might have any impact on the justices.

“Tariffs are very important to the national security, and economy of the U.S.A.,” Trump wrote on his social media site. “Based on their egregious behavior, all trade negotiations with Canada are hereby terminated.”

Canadian Prime Minister Mark Carney Friday sought to brush off Trump’s threat and vowed to keep working to head off a spiraling tit-for-tat trade war between two of the world’s closest allies and trading partners.

“We stand

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