But the tariffs are likely to rankle America’s allies like Canada and Mexico, which supply the bulk of U.S. metal imports. They could also elicit retaliation on U.S. exports, as well as pushback from American industries that use metals to make cars, food packaging and other products. Those sectors will face significantly higher prices after the tariffs go into effect.

That is what happened in Mr. Trump’s first term, when the president levied 25 percent tariffs on foreign steel and aluminum. While Mr. Trump and President Joseph R. Biden Jr. eventually rolled back those tariffs on most major metal suppliers, the levies were often replaced with other trade barriers, like quotas on how much foreign metal could come into the United States.

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