TORONTO — President Donald Trump doubled down Saturday in his feud with Canada over a television ad that used audio of former President Ronald Reagan denouncing tariffs, saying he would punish the country with an additional 10% tariff on its goods.

Trump had already suspended monthslong trade talks with Canada, the U.S.’ second-largest trading partner, on Thursday night because of the ad, which had been paid for by Ontario. Although the ad faithfully reproduced Reagan’s words, just in a different order, Trump has insisted it was “fraudulent” after the Ronald Reagan Presidential Foundation and Institute said it had made “selective” use of the five-minute original address.

The latest twist in the Canada-U.S. saga comes as the two countries have been locked in intensive talks over lowering

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