Supreme Court Restrains Executive Tariff Power, Defends Congress

The Supreme Court has ruled that the International Emergency Economic Powers Act does not let a President impose tariffs, a decision that invalidates the set of tariffs the President announced and shifts the debate over who controls trade policy back to Congress and the courts.

The Court’s majority said the statute’s phrase “regulate importation” does not extend to the power to impose tariffs, noting Congress would have spelled out that distinct authority if it meant to grant it. “We claim no special competence in matters of economics or foreign affairs,” Chief Justice John Roberts wrote in the majority opinion. “We claim only, as we must, the limited role assigned to us by Article III of the Constitution. Fulfilling that role, we hold that IEEPA does not authorize the President to impose tariffs.”

The tariffs at issue were announced in two waves: an early round tied to the fentanyl crisis and a later, broader set dubbed “Liberation Day” that began with a baseline 10 percent tariff and scaled up by country. The ruling immediately undercuts the legal basis used by the administration to justify those moves and forces a rethink about how to respond to perceived threats in supply chains and cross-border flows.

Justices Clarence Thomas, Samuel Alito and Brett Kavanaugh dissented, arguing that tariffs are a traditional tool used to “regulate importation.” “Properly read, IEEPA does not draw such an odd distinction between quotas and embargoes on the one hand and tariffs on the other,” Kavanaugh wrote in his dissent. “Rather, it empowers the President to regulate imports during national emergencies with the tools Presidents have traditionally and commonly used, including quotas, embargoes, and tariffs.”

Kavanaugh warned the ruling will bring “serious practical consequences in the near term,” flagging immediate headaches over money already collected and operational disruption at customs and ports. “The Court says nothing today about whether, and if so how, the Government should go about returning the billions of dollars that it has collected from importers,” he wrote. “But that process is likely to be a ‘mess,’ as was acknowledged at oral argument.”

He also emphasized that the decision might not shut the door on presidential action entirely because Congress has granted tariff authority elsewhere. “That is because numerous other federal statutes authorize the President to impose tariffs and might justify most (if not all) of the tariffs at issue in this case—albeit perhaps with a few additional procedural steps that IEEPA, as an emergency statute, does not require,” he wrote. That possibility points to a patchwork legal path forward rather than a clean stop to executive trade measures.

Not all of the liberal justices fully endorsed every part of the majority’s reasoning, and Justice Neil Gorsuch wrote separately to stress the constitutional allocation of lawmaking power. “The Constitution lodges the Nation’s lawmaking powers in Congress alone, and the major questions doctrine safeguards that assignment against executive encroachment,” Justice Neil Gorsuch wrote in a concurring opinion. “Under the doctrine’s terms, the President must identify clear statutory authority for the extraordinary delegated power he claims.”

The case traces back through lower courts that had already paused enforcement of the tariffs, and the high court heard arguments late last year. With the Supreme Court’s decision now on record, expect a fresh round of litigation over refunds, statutory authority in other laws, and how aggressively future administrations can use emergency statutes to address trade and security problems without explicit congressional approval.

Republicans should take two lessons from this outcome: first, if the goal is sharper, faster tools to counter unfair trade or illicit flows the executive and Congress must work together to write explicit authority; second, the decision reinforces that courts will police the boundaries of emergency powers. Lawmakers who favor decisive action on trade now face a choice—draft clear statutes or cede ground to a judicial process that prioritizes textual limits and separation of powers.