SCOTUS Ruling Blocks Trump’s Use Of International Emergency Economic Powers Act

In a decision with sweeping economic and constitutional implications, the Supreme Court on Friday struck down President Donald Trump’s attempt to use emergency powers to impose broad tariffs on U.S. trading partners — a policy he had described as “life or death” for the American economy.

The 6-3 ruling invalidates Trump’s use of the International Emergency Economic Powers Act (IEEPA) to enact his so-called “Liberation Day” tariffs, including a 10% global tariff and higher “reciprocal” tariffs on select nations. Chief Justice John Roberts authored the majority opinion, joined by five other justices, while Justices Clarence Thomas, Samuel Alito, and Brett Kavanaugh dissented.

At the heart of the case was a fundamental constitutional question: who controls tariff policy — Congress or the president?

“The Framers gave that power to ‘Congress alone,’” Roberts wrote, emphasizing that while tariffs have foreign policy implications, the Constitution explicitly vests tariff authority in the legislative branch. He rejected the administration’s argument that the IEEPA’s authorization to “regulate … importation” during a declared national emergency implicitly included the power to impose tariffs.

Trump’s legal team had argued that two words in the statute — “regulate” and “importation” — provided sufficient authority. Roberts dismissed that reasoning sharply. “Those words cannot bear such weight,” he wrote, noting that the statute does not mention tariffs and warning against reading sweeping authority into vague language.

The administration’s argument hinged on Trump’s declaration that persistent trade deficits constitute a “national emergency,” triggering IEEPA’s provisions allowing executive action in response to “unusual and extraordinary threats.” But plaintiffs countered that trade deficits have existed for decades — hardly qualifying as sudden or extraordinary. They also pointed out that in the 50 years since IEEPA’s passage, no president has used it to impose tariffs.

Lower courts had already blocked the policy. The U.S. Court of International Trade ruled that Trump lacked “unbounded authority” under the emergency statute, and the U.S. Court of Appeals for the Federal Circuit agreed. The Supreme Court’s decision affirms those findings and reinforces limits on executive economic power.

During oral arguments in November, justices from across the ideological spectrum appeared skeptical of the administration’s interpretation. They pressed Solicitor General John Sauer on whether any precedent existed for using similar statutory language to justify taxation or tariff authority. Questions also focused on what limiting principles would constrain the executive branch if the Court ruled in Trump’s favor.

Justice Brett Kavanaugh, dissenting, warned of “serious practical consequences” flowing from the decision — particularly the potential requirement that the federal government refund billions of dollars collected under the now-invalid tariffs. “The refund process is likely to be a ‘mess,’” he wrote, noting that many importers may have already passed increased costs on to consumers.

The majority opinion did not directly address the issue of refunds, leaving that question to lower courts.