The Supreme Court's 2025 decision limiting universal injunctions changes little for an individual mandamus case, and a great deal for anyone trying to undo a policy that affects thousands of files.
On June 27, 2025, the Supreme Court decided Trump v. CASA, Inc., 606 U.S. 831 (2025). Writing for a six-Justice majority, Justice Barrett concluded that universal injunctions, meaning orders that bar enforcement of a policy against anyone, not just the parties, likely exceed the equitable authority Congress gave the federal courts in the Judiciary Act of 1789. The Court granted partial stays of three such injunctions to the extent they were broader than necessary to give the plaintiffs complete relief.
Why the decision matters little for an individual delay case
A conventional mandamus or APA delay suit asks a court to order an official to decide one application, or a few. The relief was always party-specific. Nothing in CASA changes the requirements for that relief under 28 U.S.C. § 1361 and 5 U.S.C. § 706(1), or the TRAC analysis that decides whether a wait is unreasonable.
Why it matters a great deal against a policy
The picture is different when thousands of files are stalled by the same instruction, as with the USCIS adjudication holds and the 2026 immigrant visa pause. Before CASA, a single plaintiff could ask for an injunction barring the policy everywhere. After it, three routes remain, and the Court discussed or reserved each of them:
- Class actions. The opinion explains that the historical bill of peace evolved into the modern class action. A class certified under Rule 23(b)(2) can obtain an injunction that protects every member. In August 2026, the Northern District of California used that route against the USCIS holds.
- Vacatur under the APA. The Court expressly declined to decide whether the APA authorizes federal courts to vacate agency action. Lower courts continue to set aside unlawful policies under § 706(2), and a vacatur operates on the policy itself rather than as an injunction protecting particular people. That is how the District of Rhode Island treated the hold memoranda in June 2026.
- Complete relief to the parties. The Court left it to lower courts to decide how broad relief must be to make the plaintiffs whole. In some cases, complete relief for an organizational or state plaintiff may reach beyond the named individuals.
Practical consequences
For a person whose application is stalled by a policy, the question after CASA is less "has a court enjoined this policy?" and more "does any order reach me?" A vacatur reaches every application governed by the vacated policy. A class injunction reaches class members as the class is defined. An injunction in a case brought by named plaintiffs reaches those plaintiffs. Each requires checking the order itself, a question taken up in Should I Wait for a Class Action or File My Own Case?.
The decision also makes class theories built around a single agency practice more important. An example of such a theory, aimed at K-3 spousal visas, is analyzed in K-3 Mandamus Class Action. And because declaratory relief is not an injunction, the interaction between the two remedies deserves attention; see Mandamus vs. Declaratory Judgment.
What remains unsettled
The open questions after CASA are the scope of APA vacatur, the standard for "complete relief" when the plaintiff is a State or an organization, and how quickly class certification can be obtained when a policy threatens immediate harm. Until they are resolved, the form of relief matters as much as the merits.
Key points
- Trump v. CASA (June 27, 2025) held that universal injunctions likely exceed the federal courts' equitable authority.
- Individual mandamus and APA delay relief was always party-specific and is unaffected.
- Against a category-wide policy, the remaining routes are Rule 23(b)(2) class actions, APA vacatur and relief needed for complete relief to the parties.
- The Court did not decide whether the APA authorizes vacatur.
- Whether a given order reaches a given applicant depends on its form: vacatur, class injunction or party injunction.
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