The parts of the address included in Ontario’s ad focus specifically on Reagan’s longer-term vision that free trade offered the best path to economic prosperity. Photo by Andrew Harnik/Getty Images/Postmedia files

Political advertisements have a long history of taking liberties in how they use material to pack a punch. A Canadian television ad that selectively picked passages from a 1987 radio address by former President Ronald Reagan did that and more.

United States President Donald Trump late Thursday suspended trade negotiations with Canada , citing the Ontario government ad , calling it “FAKE” and an attempt to sway public opinion heading into Nov. 5 Supreme Court arguments over his authority to impose import taxes broadly.

Jason Kenney, the former premier of Alberta, defe

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