Trump will likely rely on a 1977 law that gives the president wide powers to regulate trade during a national emergency
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An earlier version of this report misstated the day President-elect Donald Trump threatened tariffs on Mexico, Canada and China.
President-elect Donald Trump has already begun to captivate financial markets with his unorthodox negotiating style, as evidenced by the reaction to his Monday night threat to impose 25% tariffs on Mexico and Canada and a surcharge tariff of 10% on China.