US President Donald Trump’s tariff regime hit a legal stumbling block last week, with rulings by the US Court of International Trade in New York and the US District Court in Washington, DC. The rulings invalidated tariffs Trump has imposed under the International Emergency Economic Powers Act (IEEPA), though those tariffs remain in place for now after the court injunctions were stayed.

Some US trading partners may be tempted to celebrate and retreat from or slow the pace of negotiations with the United States, perhaps to wait and see how appellate courts rule. But these US partners should not breathe easy, as Trump can impose substantial tariffs under other authorities that are less susceptible to legal attack—with Section 301 of the Trade Act of 1974 likely foremost among these aut

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