On June 27, 2025, the Supreme Court handed down Trump v. CASA, Inc., 606 U.S. ___ (2025) — a 6-3 ruling that substantially limits universal injunctions, the tool left-wing district judges have used for years to freeze executive-branch policies nationwide based on a handful of plaintiffs. Justice Amy Coney Barrett wrote for the majority. Justice Ketanji Brown Jackson filed a solo dissent that not one other justice joined. And Barrett did not let that dissent pass quietly.
What the Court Decided — and Why It Matters
The case arose from President Trump’s Executive Order No. 14160, which reinterpreted the Citizenship Clause of the Fourteenth Amendment to hold that children born in the United States to parents here illegally are not automatically citizens. District court judges entered universal injunctions blocking nationwide enforcement — not just as to the specific plaintiffs before them, but as to everyone in the country.
The Court held that exceeded Article III authority. Federal courts exist to resolve “cases or controversies” — disputes between actual parties — not to issue nationwide vetoes over executive action. The majority grounded its analysis in the Judiciary Act of 1789 and equity practice imported from English law at the founding. Preliminary and permanent injunctions may extend only as far as necessary to give complete relief to the parties before the court. Full stop.
This is a foundational ruling on judicial power, with implications far beyond immigration.
Eight Justices Refused to Sign Jackson’s Dissent
Consider this number: zero. That is how many of the other eight justices joined Jackson’s solo dissent. Not the six conservatives — and also not Justice Sotomayor, and also not Justice Kagan. Sotomayor wrote a principal dissent joined by Kagan and Jackson; Jackson then filed a separate dissent signed by her alone.
The majority noticed, and they were not polite about it.
Justice Barrett wrote, with five other justices behind her pen:
We will not dwell on Justice Jackson’s argument, which is at odds with more than two centuries’ worth of precedent, not to mention the Constitution itself. We observe only this: Justice Jackson decries an imperial Executive while embracing an imperial Judiciary.
A direct, named rebuke — not of the generic dissent, but of Jackson specifically. It gets sharper.
Barrett’s Line-by-Line Demolition
The majority dissects Jackson’s solo dissent argument by argument. On the core question of judicial authority and a judge’s oath:
Observing the limits on judicial authority — including, as relevant here, the boundaries of the Judiciary Act of 1789 — is required by a judge’s oath to follow the law. Justice Jackson skips over that part. Because analyzing the governing statute involves boring “legalese,” she seeks to answer “a far more basic question of enormous practical significance”: May a federal court in the United States of America order the executive to follow the law?
And then the kicker:
Justice Jackson would do well to heed her own admonition. Everyone from the President on down is bound by law. That goes for judges, too.
My read is that this is genuinely extraordinary. The majority is telling Jackson that her own rhetoric — the president must follow the law — cuts directly against what she is doing: expanding judicial power beyond what the law authorizes.
Barrett went further, targeting Jackson’s theoretical framework directly:
The principal dissent focuses on conventional legal terrain like the Judiciary Act of 1789 and our cases on equity. Justice Jackson, however, chooses a startling line of attack that is tethered neither to these sources nor, frankly, to any doctrine whatsoever. Waving away attention to the limits on judicial power as a “mind-numbingly technical” query, she offers a vision of the judicial role that would make even the most ardent defender of judicial supremacy blush.
“Tethered neither to these sources nor, frankly, to any doctrine whatsoever.” Five conservative justices joined Barrett in writing that Jackson’s dissent had no doctrinal grounding — and this language was circulated internally before publication; Jackson had every opportunity to revise.
The Second Amendment Angle Is Direct
I have been arguing for years that the universal-injunction problem cuts harder against gun owners than the standard narrative admits. Anti-2A district judges in the Ninth Circuit and elsewhere have used universal injunctions to freeze pro-gun executive actions and extend hostile rulings far beyond the parties in suit. A single hostile judge with that authority could block ATF rulemaking favorable to gun owners, nullify a pro-firearms executive order, or extend a narrow ruling into a de facto nationwide ban on a firearm configuration.
Trump v. CASA forecloses that weapon. A district court can now only enjoin the government as to the parties actually before it. That is a structural protection for the rule of law across every constitutional domain, including the Second Amendment. The fight still has to be won on the merits — but it will be won or lost on a real record with real parties, not through a unilateral decree by one hostile district judge.
The Takeaway
The 6-3 vote is a landmark separation-of-powers ruling. Barrett did the serious historical work — the Judiciary Act of 1789, English equity doctrine, Article III limits — that Jackson’s dissent conspicuously avoided, and the majority said so by name in terms unusually pointed for a Supreme Court opinion. Eight justices, by refusing to join Jackson’s solo dissent, told the legal world her vision of judicial power has no takers. That matters for constitutional law broadly — and for the Second Amendment directly.
This article is based on analysis by Professor Mark W. Smith, constitutional attorney and Host of the Four Boxes Diner 2nd Amendment channel. Watch the original video here. This does not constitute legal advice.