Why did the Supreme Court strike down Trump’s tariffs?

Supreme Court curbed the president’s emergency tariff power

In a 6-3 decision the high court rejected the administration’s use of a 1977 emergency statute to impose sweeping import levies on dozens of countries. Justices concluded the International Emergency Economic Powers Act (IEEPA) did not authorize the kind of broad, economy‑wide tariffs the White House imposed, so the bulk of that tariff program was declared unlawful.

The ruling rests on two related legal points. First, the majority applied a narrow reading of a statute that was written for limited national‑security emergencies, not routine trade policy. Second, the decision invoked the so‑called “major questions” principle: when an administration claims sweeping power under vague statutory language, Congress must have clearly authorized that extraordinary exercise of authority.

Immediate practical effects were swift:

• The specific tariffs imposed under the emergency declaration were invalidated.
• Questions opened about billions in duties already collected and whether importers will receive refunds.
• The decision curtailed the executive branch’s ability to use emergency economic powers as a substitute for legislation on major trade policy.

The opinion does not eliminate all tools for controlling imports. The court left other statutory trade authorities intact, and several justices — in concurrences and dissents — flagged alternative paths the administration could pursue. The ruling is therefore a legal rebuke that preserves Congress’s central role in major economic policymaking while leaving open narrower executive options.

Politically, the decision is a significant setback for the president’s signature trade strategy. It also sets up a likely tug‑of‑war over refunds, new tariffs under different legal authorities, and whether Congress will try to codify the president’s policies or rebuff them.