Why has U.S. President Donald Trump suspended trade talks with Canada? Why did the U.S. ambassador to Canada level an expletive-laced tirade at Ontario's trade representative, in front of more than 200 people? Why is Trump's treasury secretary accusing the Ontario government of running a psy-op?

Because of a 60-second ad, featuring clips of former president Ronald Reagan explaining why he thinks tariffs — Trump's self-professed "favourite word" — are bad economic policy.

Rick Perlstein has written extensively about the history of American conservative politics, including the book Reaganland: America's Right Turn 1976-1980. He breaks down what Reagan actually believed about tariffs and free trade, and why bringing up the spectre of Reagan — one of the most sacred figures in American conservatism — has caused so much chaos.

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