By Ginika Igboke

The Supreme Court of the United States ruled on Feb. 20 that many of the tariffs imposed by President Donald Trump under an emergency powers statute were unlawful, concluding that the law he invoked did not clearly authorize such sweeping trade measures.

Trump had declared a national emergency last year under the International Emergency Economic Powers Act (IEEPA), arguing that tariffs were necessary to curb the flow of illegal drugs into the United States and to address what he described as “large and persistent” trade deficits with foreign nations.

While the act grants the president authority to regulate certain economic transactions during a declared national emergency, the scope of that authority—particularly whether it includes the unilateral imposition of broad tariffs—became the central question before the court.

Majority: Emergency Law Did Not Clearly Authorize Tariffs

In a 6–3 decision, Chief Justice John Roberts wrote for the majority, rejecting the administration’s argument that the statutory language permitted the tariffs.

Roberts explained that the president relied on the words “regulate” and “importation” within the statute to justify his actions. However, the majority concluded that those terms did not clearly confer the authority to impose tariffs of the breadth and duration enacted.

“The President asserts the independent power to impose tariffs on imports from any country, of any product, at any rate, for any amount of time,” Roberts wrote. “Those words cannot bear such weight.”

The court emphasized that Congress holds the constitutional power over tariffs under Article I, and that delegations of such authority must be clearly stated. The majority noted that the court has historically been reluctant to infer broad transfers of congressional power based on ambiguous statutory language—particularly when core legislative powers are involved.

The ruling does not affect tariffs enacted under other statutes, leaving intact trade measures imposed through separate legislative authorities.

Dissent Warns of Economic and Diplomatic Consequences

In dissent, Justice Brett Kavanaugh warned that the practical consequences of invalidating the tariffs could be significant and complicated.

Kavanaugh suggested that the federal government may be required to refund billions of dollars to importers who paid tariffs under IEEPA. He noted that many importers may have already passed those costs on to consumers or other businesses, making the refund process potentially chaotic.

Providing refunds, he wrote, would likely be a “mess,” creating administrative and legal uncertainty.

Kavanaugh also argued that the tariffs had provided leverage in negotiating major trade agreements with countries including China, Japan, and the United Kingdom. He cautioned that the court’s decision could introduce instability into those agreements and weaken the executive branch’s negotiating position.

His dissent was joined by Justices Samuel Alito and Clarence Thomas.

Trump Signals Alternative Tariff Plans

Speaking at a White House press conference on Feb. 20, Trump expressed disappointment with the ruling and suggested that it favored foreign nations that he said had taken advantage of the United States. He also indicated frustration with certain members of the court.

Trump stated that his administration would pursue “other alternatives” to replace the rejected tariffs and said he planned to sign an order imposing a 10 percent global tariff under a different statutory authority.

Treasury Secretary Scott Bessent has previously acknowledged that other legal mechanisms exist to implement tariffs, though he described them as “not as efficient” or “not as powerful” as emergency authorities. Trump, however, asserted that alternative laws available to the administration may be “even stronger.”

U.S. Trade Representative Jamieson Greer had indicated months earlier that the administration was prepared with contingency plans should the court invalidate the emergency-based tariffs.

Debate Over the Major Questions Doctrine

Although six justices agreed that the tariffs imposed under IEEPA were unlawful, they differed in their reasoning. A key point of disagreement centered on the “major questions doctrine,” a judicial principle requiring Congress to provide clear authorization when granting the executive branch authority over matters of vast economic or political significance.

Roberts, joined by Justices Amy Coney Barrett and Neil Gorsuch, concluded that Congress had not clearly authorized the tariffs and relied in part on the major questions doctrine in their reasoning.

The court’s three liberal justices agreed that the tariffs were unauthorized but argued that ordinary statutory interpretation was sufficient to resolve the case without invoking the doctrine.

Justice Elena Kagan, writing for her colleagues, emphasized that the statute’s key language “says nothing about imposing tariffs or taxes.” She added that the term “regulate,” as commonly understood and as used by Congress, does not ordinarily encompass taxation.

In contrast, Kavanaugh and his fellow dissenters maintained that the statute’s language was broad enough to authorize the tariffs. They also contended that the major questions doctrine should not apply in matters of foreign affairs, where Congress often grants the president flexibility and discretion.

“In the foreign affairs realm, courts recognize that Congress often deliberately grants flexibility and discretion to the President to pursue America’s interests,” Kavanaugh wrote.

Future of US Trade Policy Uncertain

The decision leaves open the possibility that the administration could reimpose similar tariffs under other statutory authorities, such as those contained in longstanding trade laws. During oral arguments in November, Justice Alito questioned whether the president could have relied on the Tariff Act instead of IEEPA—a suggestion echoed in Kavanaugh’s dissent.

As the administration considers its next steps, the ruling sets a significant precedent limiting the use of emergency economic powers to reshape trade policy. At the same time, it signals that future tariff actions may hinge not on constitutional prohibitions, but on whether Congress has clearly delegated the authority the executive branch seeks to exercise.

Original article