The Legal Workaround: How Plaintiffs Are Bypassing the Supreme Court's Ban on Nationwide Injunctions

The era of the single-judge nationwide injunction was supposed to be over. For years, presidential administrations of both parties faced a recurring frustration: a single federal district court judge, often hand-picked by plaintiffs in a friendly venue, could issue an order halting a major federal policy across the entire country.[4]

That practice seemingly met its end in June 2025. In a landmark 6-3 decision in Trump v. CASA, Inc., the Supreme Court ruled that federal courts lack the equitable authority to issue "universal" injunctions that protect individuals who are not actual parties to the lawsuit. Writing for the majority, Justice Amy Coney Barrett concluded that such sweeping relief exceeded the traditional powers granted to courts by the Judiciary Act of 1789.[2][3]

The ruling was widely hailed as a victory for executive power and a death knell for the most potent weapon used by state attorneys general and advocacy groups to block federal action. But a year later, the legal landscape looks remarkably similar to the one the Supreme Court tried to dismantle.[5]

Rather than accepting defeat, plaintiffs have simply walked through a different procedural door. According to a June 2026 report from the Congressional Research Service (CRS), litigants have successfully adapted by using class-action lawsuits to achieve relief that is "functionally equivalent" to the banned nationwide injunctions.[1]

The mechanism driving this resurgence is Rule 23(b)(2) of the Federal Rules of Civil Procedure. Unlike a standard lawsuit where a plaintiff seeks relief only for themselves, a Rule 23(b)(2) class action allows a court to issue an injunction that protects an entire class of similarly situated people.[1][3]

If a judge certifies a nationwide class—for instance, all individuals subject to a specific immigration rule or environmental regulation—the resulting injunction effectively operates nationwide. The Supreme Court explicitly left this door open in the CASA decision, noting that if plaintiffs want broad relief, they must earn it through the rigorous process of class certification.[1][2]

Earning it, however, is no small feat. To certify a class, plaintiffs must satisfy four strict prerequisites under Rule 23(a): numerosity, commonality, typicality, and adequacy of representation. They must prove that the class is too large to join individually, that they share common legal questions, that the lead plaintiff's claims are typical, and that the lawyers will adequately represent everyone.[1][3]

This transforms what used to be a rapid, preliminary legal maneuver into a complex, expensive, and time-consuming evidentiary battle. Before the 2025 ruling, a plaintiff could secure a nationwide injunction in weeks based purely on legal arguments. Now, securing class-wide relief often requires extensive discovery, expert testimony, and a "rigorous analysis" by the presiding judge.[1][2]

The very litigation that sparked the Supreme Court's ruling illustrates the pivot. After the justices invalidated the universal injunctions blocking a controversial executive order on birthright citizenship, the plaintiffs immediately returned to the lower courts. They sought, and obtained, provisional class certification for all children nationwide affected by the order, securing a class-wide injunction that remains in place today.[1]

Legal scholars note that while the procedural hurdles are higher, the practical outcome for the government is often the same. The executive branch is still finding its policies halted on a national scale, but it must now expend significantly more resources fighting class certification motions before it can even defend the merits of its policies.[4][5]

Beyond class actions, plaintiffs are also leaning heavily on the Administrative Procedure Act (APA). Under Section 706 of the APA, federal courts have the authority to "set aside" or vacate unlawful agency actions.[2][3]

While an injunction is an order directed at a specific defendant, vacatur effectively erases the rule itself from the federal register. The Supreme Court explicitly declined to address whether the APA authorizes nationwide vacatur, leaving it as another potent, albeit distinct, tool for plaintiffs seeking universal relief.[3][4]

The rapid adaptation by plaintiffs has not gone unnoticed by critics of broad judicial power. Conservative lawmakers and executive branch defenders argue that nationwide class actions are simply universal injunctions wearing a procedural disguise.[5]

In his concurring opinion in the CASA case, Justice Samuel Alito warned of exactly this outcome. He cautioned lower courts to apply "scrupulous adherence to the rigors of Rule 23," lest the universal injunction "return from the grave under the guise of 'nationwide class relief.'"[5]

Congress has also attempted to intervene. In 2025, the House passed the "No Rogue Rulings Act," which aimed to severely restrict the geographic scope of injunctions against the federal government, though the bill ultimately stalled in the Senate.[1]

The CRS report notes that Congress still holds the power to tighten class certification standards specifically for cases challenging federal policies, just as it has previously done in certain immigration contexts. Until such legislation passes, the battle remains in the courts.[1]

For now, the Supreme Court has not weighed in on the recent wave of class certifications. But legal experts widely expect that as these massive class-action injunctions continue to halt federal initiatives, the justices will inevitably be asked to decide just how rigorous the Rule 23 analysis must be.[1][2]

Ultimately, the shift from universal injunctions to class-action litigation represents a fundamental recalibration of how federal policy is challenged in America. It has not ended the practice of nationwide relief, but it has ensured that only the most well-resourced and procedurally meticulous plaintiffs can achieve it.[5]