Trump v. CASA, Inc.
The Supreme Court ruled that federal courts cannot issue so-called 'universal' injunctions — orders that bar the government from enforcing a policy against everyone in the country — and scaled back three sweeping orders that had blocked President Trump's executive order restricting birthright citizenship.
The decision is a major restraint on a tool lower courts have used frequently to halt presidential policies across administrations, though the Court explicitly declined to decide whether Trump's birthright citizenship order is itself constitutional.
How it got here: Three district courts issued nationwide injunctions blocking the executive order; courts of appeals declined to stay them; the Government filed emergency applications to the Supreme Court seeking partial stays.
The Case in Depth
What happened
President Trump signed an executive order on his first day in office declaring that children born in the United States to mothers who are in the country unlawfully or only temporarily, where the father is not a citizen or lawful permanent resident, are not entitled to American citizenship. Groups of pregnant women, immigration organizations, and 22 states sued in three separate federal courts, arguing the order defies the Fourteenth Amendment's guarantee of birthright citizenship. All three courts issued sweeping injunctions blocking enforcement of the order against anyone in the country.
The question before the Court
Can a single federal court order the government to stop enforcing a law or executive order against everyone in the country, even people who never filed a lawsuit?
The Court's answer
No — federal courts cannot issue "universal" injunctions that bar the government from enforcing a law or policy against everyone in the country. The Court ruled that the Judiciary Act of 1789, which gives federal courts the power to grant equitable remedies, limits those courts to remedies that were traditionally available in English equity at the time of the founding. Because universal injunctions — protecting all persons, not just the parties who filed suit — have no founding-era equivalent and were essentially absent from American legal practice until the 1960s, they exceed what the Judiciary Act permits.
The three injunctions blocking Trump's birthright citizenship executive order were therefore scaled back to protect only the specific plaintiffs in each lawsuit. The Court did not decide whether the executive order itself violates the Constitution or the Nationality Act — that question was expressly left open and must be resolved through further proceedings.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
People who have not joined a lawsuit challenging a federal law or executive order can no longer automatically benefit from a court order blocking that law nationwide. Anyone harmed by a policy must now either join an existing suit or file their own to obtain judicial protection — a significant change to how courts have been checking executive and legislative power in recent years.
What changes now
The three lower courts must redraw their injunctions to cover only the named plaintiffs and parties with legal standing in each case. The Government may resume enforcing the executive order against anyone not specifically covered. The constitutional question — whether the birthright citizenship order violates the Fourteenth Amendment — remains entirely unresolved and must work its way back through the courts. The Court also left open whether state plaintiffs might still qualify for broader relief under a complete-relief analysis, sending that question back to the lower courts.
What this does not decide
The Court expressly declined to decide whether Trump's birthright citizenship executive order is constitutional or violates the Nationality Act. The ruling also does not resolve whether states can assert third-party standing to seek broader injunctive relief on behalf of residents, or whether the Administrative Procedure Act's separate set-aside power permits vacatur of agency rules beyond the parties.
Concurrences and dissents
How the Justices voted
Majority (6). Justice Barrett (author), joined by Justice Roberts, Justice Thomas, Justice Alito, Justice Gorsuch, and Justice Kavanaugh.
Dissent (3). Justice Sotomayor (author), joined by Justice Kagan and Justice Jackson.
Concurrence — Justice Thomas
Justice Thomas agreed fully with the majority and wrote to clarify that 'complete relief' is a ceiling on what courts can award — not a mandate or floor. Courts err if they read prior precedents as requiring them to give plaintiffs complete relief whenever possible; instead, the principle only permits complete relief and leaves room for traditional equitable limits to confine what is actually awarded. Lower courts must not use the complete-relief principle as a backdoor to revive universal injunctions.
Concurrence — Justice Alito
Justice Alito joined the majority but flagged two unresolved issues that could undermine the ruling in practice: whether state plaintiffs have 'third-party standing' to assert the constitutional rights of their individual residents, and whether district courts will strictly follow Rule 23's procedural requirements for class certification. Without vigilant enforcement of both limitations, states could routinely obtain broad injunctions covering all residents, and loosely certified nationwide classes could replicate what universal injunctions accomplished.
Concurrence — Justice Kavanaugh
Justice Kavanaugh joined the majority and wrote separately to explain that the Supreme Court itself will still serve as the ultimate arbiter of whether major new federal laws and executive orders can be enforced during the years-long period before a final merits ruling. Even without universal injunctions at the district court level, nationally uniform interim answers are often essential, and the Court has the tools and responsibility to provide them through its own stay and injunction jurisdiction.
Dissent — Justice Sotomayor
“Children born in the United States and subject to its laws are United States citizens. That has been the legal rule since the founding, and it was the English rule well before then.”The dissent's opening line, arguing the majority ignored the overwhelming legal basis for birthright citizenship.
Justice Sotomayor argued that the majority ignored the patent unconstitutionality of the birthright citizenship order — which every court to consider it found to violate settled law, history, and this Court's precedents — and that the Government failed to show irreparable harm because it has no right to enforce an unconstitutional order. She also contended that universal injunctions have deep roots in equity through bills of peace and taxpayer suits, and that even under the majority's own complete-relief theory, the injunctions in these cases were fully justified because narrower relief would not redress the plaintiffs' injuries.
Dissent — Justice Jackson
Justice Jackson agreed with Justice Sotomayor and wrote separately to argue the core issue is whether federal courts can order the Executive to follow the law universally — and that in a constitutional republic, the answer must be yes. She warned that today's ruling creates a 'zone of lawlessness' in which the Executive may violate constitutional rights of anyone who has not yet sued, disproportionately harming the poor and those without legal resources. She called the decision an existential threat to the rule of law. Read the full dissent →
How the Court got there
The legal reasoning, step by step
- The Judiciary Act of 1789 gives federal courts power over 'all suits in equity' — but the Court has long held this grant is limited to remedies that were traditionally available in English equity courts at the founding. Federal courts cannot invent new equitable remedies with no founding-era roots. This limitation controls the scope of available injunctive relief, regardless of how desirable broader relief might seem as a policy matter.
- Applying this historical test — drawn from Grupo Mexicano de Desarrollo v. Alliance Bond Fund (1999), the case that established how to measure whether an equitable remedy is historically authorized — the Court asked whether universal injunctions had any counterpart in English equity at the founding. They did not. English equity courts operated on a strictly party-specific basis: injunctions ran only between the named parties, and the Chancellor's remedies were generally confined to those before the court.
- American federal courts followed the same party-specific approach throughout the 18th and 19th centuries, consistently refusing to extend relief to non-parties. The first arguable universal injunction did not appear until 1963, and such injunctions remained rare until recent decades. Their near-total absence for nearly two centuries of American legal history — including during major waves of constitutional litigation — confirms they fall outside the equitable authority the Judiciary Act grants.
- The Court rejected respondents' main historical counter-argument: that bills of peace — an English equitable device allowing group litigation involving many claimants — serve as the founding-era ancestor of universal injunctions. The analogy fails because bills of peace involved small, cohesive groups and, critically, their decrees bound absent group members just as if they had been parties. Universal injunctions, by contrast, bind only the parties to the suit. The modern equivalent of a bill of peace is the class action governed by Rule 23, not the universal injunction — and universal injunctions impermissibly circumvent Rule 23's procedural requirements.
- The Court also rejected the 'complete relief' argument — the claim that courts have inherent equitable power to award whatever remedy fully redresses a plaintiff's injury, even if that means protecting everyone similarly situated. 'Complete relief' means only what is necessary to remedy the specific injuries of the specific plaintiffs before the court. Ordering the government not to enforce the birthright citizenship order against a pregnant plaintiff's child gives her everything she needs; extending the order to cover strangers who have not sued adds nothing to her personal relief.
- Because the Government showed a strong likelihood of success on this threshold remedial question, and because universal injunctions improperly intrude on the Executive Branch's ability to enforce its own policies against non-parties — a recognized form of irreparable harm — the Court granted partial stays. The balance of equities favored the Government: narrowing the injunctions to cover only each case's actual plaintiffs would cause respondents no harm, since they would remain fully protected.
Doctrinal impact
Cases affected by this decision
Reaffirms Grupo Mexicano de Desarrollo, S. A. v. Alliance Bond Fund, Inc. (527 U. S. 308)
Reaffirmed as the governing test: federal courts' equitable authority is limited to remedies traditionally available at the founding.
Reaffirms Nken v. Holder (556 U. S. 418)
Reaffirmed as the four-factor standard an applicant must satisfy to obtain a stay from the Supreme Court.