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Supreme Court of the United States • 2025

Trump v. CASA, Inc.

606 U.S. 831

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Takeaway

In short, Trump v. CASA holds that federal courts generally may not use universal injunctions to bar federal policies as to nonparties; relief must ordinarily be tailored to plaintiffs with standing, though class actions, APA remedies, and genuinely indivisible relief may still permit broader effects.

Background

President Trump’s Executive Order No. 14160 directed federal agencies not to recognize citizenship for certain children born in the United States—specifically, children whose mothers were unlawfully present or temporarily present and whose fathers were neither citizens nor lawful permanent residents. Individuals who were pregnant, immigrant-rights organizations, and several States sued, alleging that the Order violated the Fourteenth Amendment’s Citizenship Clause and 8 U.S.C. §1401.

District courts in Maryland, Washington, and Massachusetts each concluded that the Order was likely unlawful and entered nationwide, or “universal,” preliminary injunctions barring federal officials from enforcing it against anyone. The Fourth, Ninth, and First Circuits denied the Government’s requests to stay those broad injunctions.

The Government sought emergency partial stays from the Supreme Court. It did not ask the Court to decide whether the Executive Order was constitutional. Instead, it argued that federal courts lacked equitable authority to protect nonparties through universal injunctions and asked that relief be limited to what was necessary to redress the plaintiffs’ own injuries.

Issues

Issue #1

Whether the Judiciary Act of 1789 authorizes federal courts to issue universal injunctions that bar the Government from enforcing a policy against anyone, including nonparties.

Holding

Likely no. Universal injunctions likely exceed the equitable authority Congress gave federal courts under the Judiciary Act of 1789.

Reasoning

The Court treated the question as one of statutory equitable authority, not of the Executive Order’s legality. Under Grupo Mexicano, the equitable remedies available in federal court are those traditionally administered by English courts of equity when the Constitution and Judiciary Act were adopted. The Court expressly did not decide whether Article III independently forbids universal relief.

Historically, equitable suits and injunctions were generally party specific. The English Chancellor ordinarily resolved disputes between identified parties, and an injunction could not ordinarily bind someone who was not a party to the case. Founding-era American practice did not establish a contrary tradition; cases such as Scott v. Donald reflected the Court’s refusal to extend relief to persons beyond the named litigants.

A universal injunction has no adequate historical analogue merely because equity was flexible. Flexibility permits courts to adapt traditional equitable tools within their established boundaries; it does not permit creation of an entirely new remedy lacking a founding-era predecessor. The Court emphasized that universal injunctions did not become common until the late twentieth and early twenty-first centuries.

Bills of peace did not supply the needed historical analogue. Those representative equitable proceedings involved limited, cohesive groups and produced judgments binding the represented group. They are better understood as predecessors to the modern class action, which is governed by Rule 23 and its requirements of numerosity, commonality, typicality, and adequate representation. Universal injunctions bypass those procedural safeguards while extending practical protection to nonparties.

Policy arguments on both sides could not alter the legal result. Although universal injunctions may prevent patchwork enforcement, the Court concluded that their use also encourages forum shopping, permits one district judge to halt national policy, and forces appellate courts to decide significant questions on expedited records. In the Court’s view, those competing policy considerations cannot expand equity beyond its historical limits.

Issue #2

Whether the injunctions could nevertheless extend beyond named plaintiffs as necessary to provide complete relief to the plaintiffs before the court.

Holding

Only to the extent broader relief is necessary and appropriate to furnish complete relief to plaintiffs with standing; the individual and associational plaintiffs did not justify universal relief on the present record, while the appropriate scope of relief for the States was left for the lower courts to determine.

Reasoning

The Court distinguished complete relief from universal relief. Equity permits relief sufficient to redress the injuries of the plaintiffs in the case, and a plaintiff-specific injunction can incidentally benefit others. But incidental benefits do not transform nonparties into persons formally protected by the judgment.

For an individual pregnant plaintiff, an injunction barring enforcement of the Order against her child would completely address her claimed injury: her child would not be denied citizenship. Extending that injunction to every similarly situated child would not make the named plaintiff’s own relief more complete. The same principle applied to the individual and associational respondents’ general defense of universal relief.

The States presented a more difficult question. They argued that their financial and administrative injuries could not be remedied by a geographically limited injunction because children move between States and eligibility for federally funded benefit programs may depend on citizenship. The Government argued that narrower alternatives could address those injuries, such as barring enforcement within the plaintiff States or requiring federal treatment of covered resident children as benefit-eligible.

The Court declined to decide in the first instance whether the States need relief extending beyond their borders. It directed the lower courts to determine expeditiously what narrower injunctions, if any, are necessary under complete-relief principles and other traditional limits on equity.

Issue #3

Whether the Government satisfied the requirements for a partial stay of the preliminary injunctions.

Holding

Yes. The Government showed likely success on the scope-of-relief issue and irreparable harm from injunctions that likely exceed judicial authority; the injunctions were partially stayed insofar as they went beyond relief necessary for plaintiffs with standing.

Reasoning

Under the stay standard, the Government made a strong showing that it was likely to succeed on its claim that universal injunctions exceed the authority conferred by the Judiciary Act. The Court treated that threshold remedial issue separately from the unresolved merits question concerning birthright citizenship.

The Government would suffer irreparable harm if district courts improperly prevented it from enforcing its policy against nonparties. In the Court’s view, an overbroad injunction intrudes on a coordinate branch of government and restrains the Executive beyond the judicial authority Congress supplied, even if the underlying policy might ultimately be unlawful.

The balance of equities did not defeat a partial stay because properly tailored injunctions would continue protecting plaintiffs to the extent needed to redress their injuries. The Court therefore granted partial stays only as to excessive scope, ordered the lower courts to tailor relief promptly, permitted agencies to develop and issue implementation guidance, and provided that the Order’s operative provision would not take effect for 30 days after the decision.

Concurrences

Justice Thomas

Reasoning

Justice Thomas agreed that universal injunctions are unauthorized under the Judiciary Act because they lack a historical basis in traditional equity. He stressed that any authority for such relief would need a specific constitutional or statutory grant and suggested that a congressional attempt to authorize universal injunctions could itself raise serious constitutional questions.

He emphasized that the complete-relief principle is a ceiling, not a command to award the maximum possible remedy. Article III requires remedies tailored to the plaintiff’s particular injury, while equitable doctrine also requires attention to historical limits and fairness to defendants. Thus, a court may sometimes provide less than complete relief when traditional equitable principles so require.

Indivisible remedies may occasionally be proper, such as injunctions against a public nuisance when it is all but impossible to protect a plaintiff without incidentally benefiting others. But those cases are exceptional. Lower courts, he warned, must not recreate universal injunctions by treating administrative inconvenience or broad claims of harm as a basis for supposedly plaintiff-specific relief.

Justice Alito

Reasoning

Justice Alito agreed with the Court’s disposition but identified two possible routes around its holding. First, he warned that States may seek broad injunctions by asserting the constitutional rights of their residents. Because third-party standing ordinarily requires a close relationship with the right holder and a genuine hindrance to the right holder’s ability to sue, he urged lower courts to enforce those requirements rigorously, particularly where a State asserts only collateral injury.

Second, he cautioned that universal injunctions could reappear through overly broad Rule 23 class certification. Class actions may sometimes properly support nationwide relief, but only after the rigorous analysis required by Rule 23. District courts should not treat the Court’s ruling as permission to certify broad classes without carefully applying numerosity, commonality, typicality, adequacy, and other procedural protections.

Justice Kavanaugh

Reasoning

Justice Kavanaugh agreed that district courts may award nationwide or classwide preliminary relief only when a recognized legal mechanism authorizes it. He noted two such possible avenues: an injunction for a properly certified Rule 23(b)(2) class and, in an appropriate Administrative Procedure Act case, an order setting aside unlawful agency action. The decision, he explained, brings procedural discipline to preliminary challenges to major federal actions.

He focused on the separate problem of the interim legal status of significant federal statutes, regulations, and executive orders while merits litigation proceeds for years. In his view, national uniformity is often important because a patchwork of enforcement rules may be unworkable for nationwide programs, businesses, and people who move across state lines.

He maintained that the Supreme Court will often remain the ultimate decisionmaker on that interim national question. Whether lower courts issue plaintiff-specific rulings, classwide injunctions, or APA set-aside orders, losing parties can seek emergency relief in the courts of appeals and then in the Supreme Court. The Court’s responsibility to resolve consequential stay and injunction applications, he wrote, is a central part of its role rather than a distraction from it.

Dissents

Justice Sotomayor

Reasoning

Justice Sotomayor argued that the Executive Order is plainly unconstitutional. The Fourteenth Amendment’s text, the common-law rule of birthright citizenship, the history of the Reconstruction Amendments, United States v. Wong Kim Ark, later Supreme Court decisions, 8 U.S.C. §1401, and longstanding Executive Branch practice all establish that children born in the United States are citizens except in narrow circumstances not implicated here. In her view, the Government avoided seeking a merits stay because it could not plausibly defend the Order’s legality.

She argued that the Government failed to show irreparable harm. The injunctions merely required the Executive to comply with a settled constitutional rule, and the Government has no legitimate interest in enforcing an unconstitutional policy. The majority, she maintained, improperly treated the Government as harmed whenever it is prevented from carrying out an executive policy, even one that violates the Constitution.

She rejected the majority’s historical account of equity. Equity traditionally sought complete justice through flexible remedies, including bills of peace and taxpayer suits that could settle disputes affecting broad groups and prevent a multiplicity of lawsuits. In her view, early federal decisions—including Lewis Publishing, Pierce, and Barnette—also show that broad injunctions protecting nonparties have historical roots.

Even under the majority’s complete-relief framework, she argued, these injunctions were justified. The organizational plaintiffs had members nationwide, and the States showed that a geographically limited injunction would not eliminate financial and administrative injuries caused by children moving across State lines. The Government’s proposed narrower alternatives were forfeited below and would create an unworkable two-tier citizenship and benefits system.

She warned that the decision leaves constitutional rights practically unenforceable for people unable to bring their own lawsuits. Although class actions remain available, certification is costly, time-consuming, and vulnerable to procedural challenges. The Court’s restriction on universal relief, she concluded, invites the Executive to enforce even plainly unlawful policies against everyone except the relatively few people able to secure individual judicial protection.

Justice Jackson

Reasoning

Justice Jackson agreed fully with Justice Sotomayor and argued that the decision threatens the rule of law itself. In a constitutional system, she wrote, courts must be able to require the Executive to comply with the Constitution. A judicial system that allows an Executive to continue conduct a court has found unlawful against anyone who has not sued creates an impermissible zone of executive lawlessness.

She rejected the majority’s view that courts function only to award complete relief to private parties. Courts also declare what the law requires and enforce constitutional constraints against the Government. In her view, the majority’s reliance on the historical limits of English Chancery overlooks the fundamentally different relationship between American courts and an Executive who is constitutionally subordinate to law rather than a monarch above ordinary judicial control.

The decision, she argued, creates two tracks: named plaintiffs receive protection, while those without lawyers, resources, information, or time to sue remain subject to an Executive policy already found likely unconstitutional. This burden will fall disproportionately on poor, unrepresented, and unpopular people, undermining the Constitution’s promise of equal legal protection.

Universal injunctions do not improperly give nonparties an unearned windfall, she reasoned. Constitutional rights preexist litigation and constrain the Executive from the outset. When a court universally bars unlawful executive conduct, it restores the protection that all persons were already owed; when it cannot do so, it permits the Executive to deny those protections at will.

Justice Jackson acknowledged policy objections to universal injunctions but considered them far less serious than requiring judges to tolerate known constitutional violations. She concluded that the Court had weakened the Judiciary’s core responsibility to enforce constitutional limits and had made future executive lawlessness more likely.