U.S. President Donald Trump announced on Thursday that he had terminated trade negotiations with Canada in response to an advert produced by the government of Ontario featuring historic footage of President Ronald Reagan arguing that tariffs undermine economic prosperity.

Newsweek contacted Canadian Prime Minister Mark Carney and Ontario Premier Doug Ford for comment on Friday via email outside regular office hours.

Why It Matters

Trump has made sweeping tariffs on American trade partners one of the centerpieces of his economic policy, including a 35 percent tariff on many imports from Canada , though goods covered by the United States-Mexico-Canada Agreement have mostly been excluded.

This marks another blow to U.S.-Canadian relations, which have been tense since Trump’s repeated

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