A key Supreme Court decision limits presidential tariff power and reinforces why legal discipline matters for international trade.
In Learning Resources v. Trump, the U.S. Supreme Court confronted the legal aftermath of President Donald J. Trump’s “Liberation Day” tariffs. On April 2, 2025, President Trump stood in the White House Rose Garden holding a placard with sharply different rates—34 percent for China, 20 percent for the European Union, and 46 percent for Vietnam—and called the moment “our declaration of economic independence.” But the more consequential claim was one of legal power. With a novel invocation of the International Emergency Economic Powers Act (IEEPA), a statute designed for foreign economic emergencies, the President claimed the power to impose a baseline tariff on all trading partners, higher country-specific “reciprocal” tariffs, and tariffs in retaliation for perceived drug-trafficking offenses on Canada, Mexico, and China. Governments and firms then had to ask not only how high U.S. tariffs would be, but whether American trade policy still operated within a legal framework they could understand and rely upon.
That question matters beyond U.S. separation of powers. At a moment when the international trading system can no longer reliably discipline unilateral tariff action, Learning Reed States—can supply some of the regularity, predictability, and constraint that the global trade order once offered
Modern international economic law took the form it did to answer precisely these questions. The General Agreement on Tariffs and Trade, and later the World Trade Organization (WTO), rested on a modest but essential premise: International economic relations require a measure of certainty, regularity, predictability, and restraint. Tariffs would be bound rather than invented anew. Like products would generally be treated alike, regardless of origin. Domestic regulation could not generally be used as protectionism in disguise. Departures from ordinary commitments—safeguards, national security measures, emergency action—would have to be justified within recognized legal categories. Disputes would be channeled through institutions rather than left to unilateral escalation. None of this eliminated economic conflict, but it made trade conflict more structured and more manageable.
Liberation Day did the opposite. It replaced tariff schedules, negotiated commitments, and recognized exceptions with a claim that the U.S. President could, by emergency decree, impose radically different duties across the world economy.
Liberation Day would have tested even a functioning system of international economic law. It is more destabilizing now because that system is already weakened badly. With the WTO Appellate Body no longer operating, trade disputes can be frozen through appeal to an empty tribunal. As a result, WTO rules no longer carry the enforcement discipline they were designed to provide. That, however, does not make law irrelevant. It changes where legal discipline must come from. When international economic law can no longer reliably discipline unilateral tariff action, domestic law must do more work. That is the significance of Learning Resources.
President Trump’s tariff program rested on an aggressive answer to that question. IEEPA gives the President broad authority, after declaring a national emergency, to “regulate” certain international economic transactions, including “importation.” The Administration built an entire tariff regime on that word. As the Court framed it, the President claimed authority to impose tariffs “of unlimited amount and duration, on any product from any country.” Chief Justice John G. Roberts’s answer was blunt: “Those words cannot bear such weight.”
The holding of Learning Resourceswas narrow, but significant. IEEPA does not authorize the President to impose tariffs. The Court treated tariffs not simply as trade regulation, but as duties—an exercise of Congress’s taxing power. That treatment matters because the Constitution gives Congress, not the President, the power to tax. Congress may delegate tariff authority to the executive, as it has in other statutes. But when it does, the Court emphasized, it speaks expressly and imposes limits. IEEPA contains a long list of emergency economic powers, but it does not mention tariffs or duties. That silence is significant.
The Court divided on how to get to the conclusion that IEEPA does not authorize tariffs. Three Justices—Chief Justice Roberts, Justice Neil M. Gorsuch, and Justice Amy Coney Barrett—understood the case through the major questions doctrine: that a claim of this magnitude required clear congressional authorization, and neither emergency nor foreign affairs changed that. Three others—Justice Elena Kagan, Justice Sonia Sotomayor, and Justice Ketanji Brown Jackson—reached the same result through ordinary statutory interpretation. That division is important. It means the decision is not simply another major questions case. A cross-ideological majority agreed on the more basic point: Emergency economic authority is not a substitute for tariff law.
The Justices’ convergence gives Learning Resources significance beyond questions of separation of powers in the United States. The decision forces U.S. tariff policy back into recognizable legal channels. As the Court stated, “when Congress has delegated its tariff powers, it has done so in explicit terms, and subject to strict limits.” That insistence on explicit authority and legal limits is what produces regularity and predictability. It tells other countries and firms that tariffs must be imposed under statutes that actually authorize them, through procedures and limits that can be understood in advance. That is only a partial substitute for international economic law, but it is a meaningful one. After Learning Resources, the President may still use tariffs aggressively. But he cannot use IEEPA as a shortcut around the legal architecture of trade.
Still, Learning Resources does not deny that other tariff statutes exist. Justice Brett Kavanaugh pressed the point in dissent, saying the Court had found only that the President “checked the wrong statutory box.” The President can try other boxes, among them Section 122 for temporary balance-of-payments tariffs, Section 232 for national-security tariffs, and Section 301 for unfair trade practices. Those are real tariff authorities. But they come with legal requirements that IEEPA did not: predicates, findings, procedures, time limits, and statutory categories. As former Biden-Administration official Peter Harrell has written, the fallback authorities “all require fact-finding and procedural steps, and/or impose limits on the value of tariffs that can be imposed,” making them “less flexible than IEEPA.” That is likely why IEEPA was attractive to the Administration. It offered tariff power without the regularity imposed by tariff law.
Those fallback statutes, therefore, show both the value and the limits of domestic law. A tariff imposed under Section 122, 232, or 301 is more legally regular than an IEEPA tariff: easier to contest, easier to understand, and somewhat easier to predict. But it remains a unilateral U.S. action. It cannot replace the reciprocal commitments, nondiscrimination rules, and external discipline of international economic law. If WTO discipline remains weak, domestic law must do more than require the right statutory label. It must make statutory predicates, procedures, limits, and purposes matter.
That is not a concession to foreign governments or global trade lawyers. It is in the United States’ own interest. Predictable legal limits make American trade policy more credible, reduce uncertainty for U.S. firms and consumers, preserve leverage with allies, and make retaliation less likely. Emergency tariff power may look like flexibility, but without legal discipline, it becomes instability. Learning Resources restores some law to U.S. tariff policy. It does not restore the legal order on which the global economy depends. But it reminds us why that order served the United States in the first place.
William Burke-White is a professor of law at theUniversity of Pennsylvania Carey Law School.
This essay is part of a series titled, “The Supreme Court’s 2025-2026 Regulatory Term.”
Tagged: IEEPA, Learning Reurt, WTO
