But advisers have also discussed the idea of assigning different tariff levels to countries depending on the trade barriers those countries impose against American products. They have also said that some nations might avoid tariffs entirely by striking trade deals with the United States.

Speaking to reporters in the Oval Office on Monday, Mr. Trump said the United States would be “very nice, relatively speaking,” in imposing tariffs on a vast number of countries — including U.S. allies — that he believes are unfairly inhibiting the flow of American exports.

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