President Trump escalated his dispute with Canada, vowing an additional 10 percent tariff after Ontario aired a TV ad that rearranged Ronald Reagan’s anti-tariff remarks. He had already halted months of trade talks Thursday, calling the spot fraudulent, though the Reagan Foundation called it selective and Ontario said the authentic audio’s edits didn’t change its meaning. The province will pull the ad Monday; it ran during the World Series opener in Toronto. The Supreme Court hears challenges to Trump’s tariffs next month, even as existing levies on steel, aluminum, lumber and some auto parts remain.

Prepared by Lauren Mitchell and reviewed by editorial team.