The major questions doctrine has emerged as the most consequential structural constraint on federal agency authority in a generation. In the span of four years — from West Virginia v. EPA in 2022 to Learning Resources, Inc. v. Trump in February 2026 — the Supreme Court has deployed the doctrine to invalidate the EPA's carbon-trading authority, the Department of Education's $430 billion student loan cancellation program, and the President's use of emergency economic powers to impose sweeping tariffs on virtually all U.S. imports. Understanding the doctrine's origins, its current doctrinal contours, and the unresolved questions it leaves behind is essential for anyone engaged in federal regulatory practice.
Origins
The phrase "major questions" entered legal discourse in a 1986 law review article by then-First Circuit Judge Stephen Breyer, who observed that Congress is "more likely to have focused upon and answered major questions" rather than leaving them to agency discretion. The concept first appeared in the Supreme Court's reasoning, though without the label, in MCI Telecommunications Corp. v. AT&T Co., 512 U.S. 218 (1994), where Justice Scalia concluded that the Federal Communications Commission's authority to "modify" tariff requirements could not be read to authorize the effective elimination of rate regulation for an entire industry.
The doctrine took its clearest early form in FDA v. Brown & Williamson Tobacco Corp., 529 U.S. 120 (2000). The Food and Drug Administration had concluded that tobacco products qualified as "drugs" and "devices" under the Food, Drug, and Cosmetic Act and sought to regulate them accordingly. The Court rejected this reading, reasoning that Congress could not have intended to delegate authority over an industry of such "economic and political significance" through general statutory language — particularly where accepting the FDA's interpretation would have required the agency to ban cigarettes entirely, a result Congress had specifically declined to enact. Brown & Williamson established the core intuition that would animate the later doctrine: courts will not presume that Congress hid transformative regulatory authority in ambiguous or general statutory text.
The Chevron Relationship and West Virginia
For nearly two decades following Brown & Williamson, the doctrine operated as an implicit exception to Chevron deference — the principle, established in Chevron U.S.A., Inc. v. Natural Resources Defense Council, Inc., 467 U.S. 837 (1984), that courts defer to reasonable agency interpretations of genuinely ambiguous statutes. The major questions exception meant that agencies could not rely on Chevron to justify claims of authority over issues of vast significance, even where the underlying statute was genuinely ambiguous.
The doctrine was explicitly named and elevated to independent doctrinal status in West Virginia v. EPA, 597 U.S. 697 (2022). The case concerned the EPA's Clean Power Plan, which relied on Section 111(d) of the Clean Air Act to require states to implement emission reduction systems — interpreted broadly enough to authorize the agency to effectively mandate a nationwide shift in electricity generation away from coal toward natural gas and renewables. Writing for the Court, Chief Justice Roberts held that this "generation shifting" approach represented an assertion of authority of such "economic and political significance" that clear congressional authorization was required — and absent from the statutory text. The Court characterized the provision the EPA had relied upon as a "previously little-used backwater" of the Clean Air Act and concluded that Congress would not have delegated to the agency the power to "decide, across the board, the most efficient way to regulate carbon dioxide emissions" through such a provision.
West Virginia was also the first majority opinion to use the phrase "major questions doctrine" explicitly, formally recognizing what the Congressional Research Service describes as "an identifiable body of case law addressing agencies repeatedly asserting transformative authority unsupported by legislative mandate." The governing test as articulated in West Virginia has two components: whether the underlying claim of authority concerns an issue of "vast economic and political significance," and if so, whether Congress has clearly empowered the agency with that authority.
Two years later, in Loper Bright Enterprises v. Raimondo, 603 U.S. 369 (2024), the Court overruled Chevron entirely. The majority held that courts — not agencies — bear the ultimate responsibility for determining statutory meaning, and that statutory ambiguity does not constitute an implicit congressional delegation of gap-filling authority to the executive branch. With Chevron gone, the major questions doctrine no longer functions as an exception to a background rule of deference. It now operates as a freestanding canon of statutory interpretation, applicable whenever an agency asserts transformative authority of major significance.
The Doctrine Applied: Biden v. Nebraska
Biden v. Nebraska, 600 U.S. 477 (2023), applied the doctrine outside the conventional regulatory context. The Biden administration had invoked the Higher Education Relief Opportunities for Students Act of 2003 (HEROES Act) — enacted in the wake of September 11 to give the Secretary of Education authority to "waive or modify" statutory and regulatory provisions applicable to federal student loan programs during national emergencies — to discharge up to $10,000 in federal student loan debt per borrower, and up to $20,000 for Pell Grant recipients. The program would have cancelled approximately $430 billion in outstanding debt.
The Court held 6–3 that the HEROES Act did not authorize this action. Chief Justice Roberts, writing for the majority, reasoned that the statutory authority to "waive or modify" provisions could not be stretched to encompass the wholesale cancellation of loan obligations — a transformation of the federal student loan program, not a modification of it. The majority applied the major questions doctrine to reinforce this conclusion, observing that the doctrine arises from "all corners of the administrative state," not solely from traditional notice-and-comment rulemaking. Biden v. Nebraska thus extended the doctrine beyond agency rulemaking to encompass executive exercises of statutory waiver authority.
The Plurality's Frontier: Learning Resources, Inc. v. Trump
The most significant — and doctrinally complex — recent application of the major questions doctrine came in Learning Resources, Inc. v. Trump, 607 U.S. ___ (Feb. 20, 2026), which addressed the Trump administration's use of the International Emergency Economic Powers Act (IEEPA) to impose sweeping tariffs on imports from dozens of countries — including a 145% effective tariff rate on most Chinese goods.
The Court's 6–3 judgment vacating the tariffs was unanimous in result but fractured in reasoning. Chief Justice Roberts announced the judgment and authored a principal opinion carrying two distinct coalition tiers. Parts I, II-A-1, and II-B — constituting the opinion of the Court, joined by Justices Sotomayor, Kagan, Gorsuch, Barrett, and Jackson — concluded as a matter of statutory construction that IEEPA's authorization to "regulate importation" does not authorize the imposition of tariffs: the word "regulate" does not ordinarily mean "tax," the statute never mentions duties or tariffs, and no prior president had read IEEPA to confer this authority in the statute's fifty-year history. Parts II-A-2 and III, joined only by Justices Gorsuch and Barrett, applied the major questions doctrine, holding that the claimed authority — to impose tariffs of unlimited amount, duration, and scope on all imports from any country — was a question of sufficient economic and political magnitude that it required clear congressional authorization, which IEEPA's text does not supply.
Justice Kagan, joined by Justices Sotomayor and Jackson, concurred in the judgment but explicitly rejected the major questions framing, arguing that ordinary tools of statutory interpretation were sufficient to resolve the case and that invoking the doctrine placed an unnecessary thumb on the interpretive scale. Justices Thomas and Alito joined Justice Kavanaugh's principal dissent, which would have upheld the tariffs.
The internal division on the MQD carries significant doctrinal consequences. As Lawfare's post-decision analysis observes, Learning Resources did not produce a majority holding on the major questions doctrine itself — the plurality's MQD analysis is not binding precedent in the same manner as the Court's statutory holding. Justice Gorsuch's concurrence grounds the doctrine in a structural constitutional principle rooted in Article I's vesting of legislative power in Congress, while Justice Barrett's shorter concurrence adopts a more contextual textualist framing and explicitly distances itself from what she characterizes as a "magic words" test. These are not merely stylistic differences — they represent competing visions of the doctrine's constitutional foundation and future scope that Learning Resources leaves unresolved.
The Doctrine as Administrative Tool: EPA's Greenhouse Gas Endangerment Finding Repeal
Two days before Learning Resources was handed down, the EPA announced what Administrator Lee Zeldin described as "the single largest act of deregulation in the history of the United States of America." On February 12, 2026, the agency finalized the rescission of its 2009 Greenhouse Gas Endangerment Finding — the administrative determination that greenhouse gas emissions endanger public health and welfare — and repealed all federal GHG emission standards for light-, medium-, and heavy-duty vehicles and engines. The final rule was published in the Federal Register on February 18, 2026, and takes effect April 20, 2026.
The doctrinal move at the center of the rule's preamble is significant: the EPA did not merely argue that its prior regulatory approach was scientifically or policy unsound. It invoked the major questions doctrine affirmatively as a legal rationale for deregulation. Citing West Virginia v. EPA and Utility Air Regulatory Group v. EPA, the preamble concludes that the federal policy response to global climate change is a question of "vast economic and political significance" that Congress did not clearly authorize EPA to resolve under Section 202(a)(1) of the Clean Air Act. In the agency's framing, the absence of clear congressional authorization for climate regulation — the very deficiency the Court identified in West Virginia to constrain the EPA's expansion — now equally bars the agency from maintaining the regulatory infrastructure it built over fifteen years.
This is a doctrinal inversion worth examining carefully. The major questions doctrine was developed by courts as a check on agencies claiming transformative authority they were never clearly granted. The EPA is now deploying it as an internal administrative rationale to justify dismantling authority the agency previously exercised — and that the Supreme Court in Massachusetts v. EPA, 549 U.S. 497 (2007), confirmed the agency possessed. Whether the MQD can properly function in this direction — as an agency's own justification for concluding it lacks authority, rather than a judicial check on claimed excess — is a question courts have not yet resolved.
Critics have been pointed on this issue. As Bloomberg Law's analysis argues, the EPA's MQD argument misreads the doctrine's triggering conditions: the regulation of greenhouse gases under the Clean Air Act is neither unheralded nor a novel assertion of authority, two features the Supreme Court has treated as hallmarks of the extraordinary cases the doctrine addresses. Regulating vehicle emissions has been EPA's core mandate since the Clean Air Act's enactment, and Massachusetts v. EPA — a 5–4 decision whose five-justice majority is no longer intact — specifically held that greenhouse gases fall within the statute's reach.
The litigation challenging the repeal has already commenced. Petitions have been filed in the D.C. Circuit by a coalition of seventeen health and environmental groups, by a public interest group on behalf of eighteen young people, and a multistate coalition of attorneys general led by California is also expected to file. A group of 25 states led by West Virginia and Kentucky filed a motion to intervene to defend the rule. As Davis Polk has observed, substantive briefing has not yet been filed, but petitioners are expected to argue that the rescission effectively nullifies Massachusetts v. EPA and contradicts the settled scientific record underlying the 2009 finding. The Supreme Court is the likely ultimate destination.
The Endangerment Finding repeal also carries downstream consequences beyond vehicle emissions. As noted by Georgetown's Environmental Law Review, the EPA's legal rationale implicates similar endangerment findings underlying stationary source and aircraft emissions regulation, and the agency has separately proposed repealing GHG emission standards for fossil fuel-fired power plants under Section 111 of the Clean Air Act. The trajectory of federal climate regulation now turns substantially on how courts — and ultimately the Supreme Court — reconcile Massachusetts v. EPA with the Roberts Court's more recent embrace of the major questions doctrine.
What Remains Open
Several questions of substantial practical import remain unsettled in the doctrine's wake.
First, the scope of the MQD's application to presidential — as distinct from agency — action. Learning Resources confirms that the doctrine applies when the President exercises statutory authority of major significance, but the plurality's reasoning may be narrower than it appears: the tariff power is a core Article I congressional prerogative, making IEEPA an unusually strong case for MQD application. Whether the doctrine applies with equal force to presidential assertions of authority in domains where Article II provides an independent constitutional foundation remains an open question the plurality did not fully close.
Second, the relationship between the major questions doctrine and the nondelegation doctrine. Justice Gorsuch's concurrence in Learning Resources — like his earlier writings — treats the MQD as closely linked to, if not a functional application of, nondelegation principles. Justice Barrett's concurrence pushes back on this framing. The constitutional grounding of the doctrine matters because constitutionally-rooted canons carry more constraining force than purely linguistic ones — and because a constitutionally-grounded MQD would limit Congress's ability to cure the problem through clearer statutory language.
Third, whether the MQD can operate as an agency's own rationale for concluding it lacks regulatory authority, as the EPA has now asserted. The doctrine developed as a judicial interpretive tool, not an administrative one. If agencies can invoke it to self-limit their own authority — and courts accept that framing — the doctrine's reach expands significantly, with implications that extend well beyond climate regulation.
Fourth, the threshold for "majorness." The Court has not articulated a precise metric for determining when an agency action rises to the level of economic and political significance that triggers MQD scrutiny. Prior cases point to several indicators — enormous cost, intrusion into domains traditionally regulated by states, first-ever exercises of statutory authority, and transformative effects on regulated industries — but the doctrine continues to operate as something closer to a gestalt judgment than a defined test. The EPA's Endangerment Finding repeal will test whether courts accept the agency's self-assessment that its own prior regulatory program exceeded its congressional mandate.
Practical Significance
The major questions doctrine reshapes the baseline assumptions of federal regulatory practice. Agencies can no longer rely on broad or aging statutory authority to address novel and consequential regulatory problems — the absence of clear congressional authorization is now a litigation risk that must be assessed at the outset of any significant rulemaking. For parties on the other side of agency action, the doctrine provides a meaningful tool to challenge regulations that claim transformative authority from statutory language that does not unmistakably confer it.
The EPA's invocation of the doctrine to justify the repeal of its own Endangerment Finding adds a further dimension: the MQD is no longer solely a constraint on regulatory expansion. It is becoming a contested instrument of deregulatory policy, and courts will have to determine whether the doctrine's logic travels in that direction.
Congress, too, faces a changed landscape. The doctrine's implicit demand is that lawmakers accept responsibility for major policy choices rather than delegating them to agencies through broadly worded enabling statutes. Whether Congress has the institutional capacity to meet that demand — in an era of persistent legislative gridlock — is a question the doctrine itself cannot answer.
This article provides general information and does not constitute legal advice. Anthony O. Maceira, Esq. is the Managing Member of Maceira Zayas Law, a law firm based in San Juan, Puerto Rico, with offices in Washington, D.C. The firm advises clients on federal regulatory strategy, government affairs, and administrative law.
