On May 28, 2025 the little-known federal Court of International Trade issued its ruling in two challenges — one brought by 12 states attorneys general and one by private companies — to President Trump’s authority to issue tariffs using the International Emergency Economic Powers Act (IEEPA). 

No prior president has used IEEPA to support tariffs, as IEEPA has historically been viewed as only a sanctions authority. In a unanimous per curiam opinion, the three-judge panel of the court invalidated using IEEPA to support tariffs under Article I, Section 8, clauses 1 and 3 of the Constitution, which assign to Congress “the exclusive powers to ‘lay and collect Taxes, Duties, Imposts, and Excises’ and to ‘regulate Commerce with foreign Nations.'” 

After an extensive review of Congress’ delegation of trade authorities dating back to 1916, the court quotes IEEPA’s provision that its “authorities ‘may only be exercised to deal with an unusual and extraordinary threat with respect to which a national emergency has been declared… and may not be exercised for any other purpose.'” The court held that IEEPA does not delegate Congress’ power to the President “in the form of authority to impose unlimited tariffs on goods from nearly every country in the world.”

Concluding that IEEPA does not authorize any of the “Worldwide, Retaliatory, or Trafficking Tariff Orders,” the court found that narrowly tailored relief was inappropriate as “if the challenged Tariff Orders are unlawful as to Plaintiffs they are unlawful as to all.” 

As a result, the challenged orders were permanently enjoined nationwide, allowing 10 calendar days for orders to be issued. The Trump Administration immediately filed for a motion to stay and appealed the order to the Court of Appeals for the Federal Circuit. The ruling halts the collection of the duties that were based on IEEPA under Executive Orders 14193, 14194, 14195 (the “Trafficking Tariffs”), and 14257 (the “Worldwide and Retaliatory Tariffs”) and all their amendments. 

The “Trafficking Tariffs” are those imposed on Canada, Mexico, and China and the “Worldwide and Retaliatory Tariffs” are the global 10% ad valorem and the “reciprocal” global tariff schedule. It also reinstates de minimis treatment for shipments valued at less than $800. The ruling may also require refunding tariffs already paid.

Tariffs based on other authorities, including Section 232 tariffs on automobiles, aluminum, and steel, and Section 301 tariffs on China, remain in effect.

The ruling will likely throw a wrench into ongoing trade negotiations with dozens of countries, even while it is under appeal. In addition to the substantive ruling on IEEPA authority, both the nationwide injunction and the request for a stay pending appeal could make their way swiftly to the Supreme Court’s so-called “shadow docket” for emergency relief. 

In addition, Congress may seek to ratify the tariffs, or the administration may seek to reinstate the tariffs using other delegated authorities. The ruling is unlikely to bring an end to the volatility that has surrounded the tariffs since they were imposed in April, and long-term planning around tariffs will continue to be challenging.