The latest ruling from the United States Court of International Trade is more than a setback for Donald Trump’s trade agenda. It is a reminder that even aggressive economic policy must remain tethered to the law.

For years, tariff policy has drifted away from congressional oversight and toward unilateral presidential action. Trump’s use of Section 122 of the Trade Act of 1974 represented one of the boldest examples yet. The statute was designed for extraordinary “balance-of-payments” emergencies, not as a flexible tool to punish trading partners or reshape global commerce by executive decree. The court’s ruling correctly recognized that a trade deficit is not automatically the same thing as a balance-of-payments crisis.

This distinction matters. If presidents are allowed to reinterpret old statutes however they wish, Congress becomes increasingly irrelevant in setting economic policy. Tariffs affect every American — consumers paying higher prices, manufacturers navigating disrupted supply chains, and exporters facing retaliation abroad. Decisions with such sweeping consequences should not depend on legal improvisation from the White House.

The ruling also highlights the growing judicial skepticism toward expansive claims of executive authority. Earlier this year, the Supreme Court of the United States rejected Trump’s separate tariffs imposed under emergency powers law. Now another court has found that a different legal pathway was also improperly used. Together, these decisions send a clear message: statutes cannot simply be stretched to fit political objectives.

None of this means tariffs are inherently wrong. Strategic trade protections can sometimes support domestic industries or respond to unfair foreign practices. But there is a constitutional process for imposing them. Congress writes the laws. Presidents enforce them.

In the end, the court’s decision is not merely about tariffs. It is about preserving the balance of powers that prevents any administration — Republican or Democrat — from governing by economic fiat.