Supreme Court Redraws Federal Litigation Rules, Congress Can Respond

Why It Matters

A new Congressional Research Service report on Supreme Court civil procedure rulings from the October 2025 term reveals decisions with sweeping consequences for immigration enforcement, energy policy, and the rights of nonprofits, and a Congress with the tools to respond.

Seven cases. Seven rulings on the plumbing of the American legal system. And yet what the Congressional Research Service laid out in its May 28 report on Supreme Court civil procedure cases from the October 2025 term is anything but dry procedural housekeeping.

The cases, spanning questions of who can sue, in which court, under what rules, and on what timeline, carry direct consequences for some of the most contested policy fights in Washington: private immigration detention, state-level investigations of pro-life nonprofits, pipeline litigation, and corporate defendants maneuvering between state and federal courts. The CRS, Congress's nonpartisan research arm, made the stakes plain: lawmakers have the authority to amend the very statutes and rules the Court interpreted, and these rulings offer a roadmap for how the justices might treat any legislation that follows.

The central tension embedded in this report is one of institutional power. The Supreme Court has spent this term drawing sharper lines around what federal courts can and cannot do: who gets in, who gets thrown out, and how long anyone has to act. Those lines now define the terrain on which the Trump administration's most aggressive policies will be litigated, and on which a Republican-controlled Congress could choose to intervene.

The Big Picture

Congress has long held constitutional authority to regulate the jurisdiction and procedures of federal courts. The Federal Rules of Civil Procedure are promulgated by the Supreme Court under the Rules Enabling Act but are subject to congressional review and revision. That architecture is precisely why the CRS flagged these seven civil procedure cases Supreme Court watchers have been tracking since October.

The October 2025 Supreme Court term opened with a docket unusually heavy with procedural questions, and the justices wasted little time issuing consequential rulings. The first two decisions landed on the same day, January 20, 2026.

In Berk v. Choy, an eight-justice majority held that Delaware's requirement that medical malpractice plaintiffs attach an expert affidavit to their complaint cannot apply in federal court. Writing for the Court, Justice Barrett found the state rule in direct conflict with Federal Rule of Civil Procedure 8, which requires only "a short and plain statement of the claim." The ruling reinforces the supremacy of federal procedural rules in diversity cases and forecloses state legislatures from imposing additional pleading burdens on litigants who find themselves in federal court.

That same day, in Coney Island Auto Parts Unlimited v. Burton, the Court addressed a different procedural bottleneck: how long a party has to challenge a judgment it claims is void. Justice Alito, writing for seven colleagues, held that even motions alleging a judgment is a legal nullity must be filed within a "reasonable time" under FRCP 60. The ruling rejected the intuitive argument that a void judgment can be challenged at any point, and in doing so, imposed a discipline on litigation that lower courts had long resisted applying.

February brought two more significant rulings. In Hain Celestial Group v. Palmquist, a toxic baby food case that began in Texas state court, Justice Sotomayor wrote unanimously that a federal court cannot manufacture diversity jurisdiction by erroneously dismissing a nondiverse defendant. If the jurisdictional defect was present at the time of removal and was never properly cured, the final judgment must be vacated. Justice Thomas, concurring separately, went further, expressing skepticism of the entire "improper joinder" doctrine, which he argued allows federal courts to assess the merits of claims over which they lack jurisdiction in the first place.

The following day, in GEO Group v. Menocal, the Court addressed whether a private immigration detention contractor could immediately appeal a trial court's refusal to dismiss a lawsuit on grounds of federal contractor immunity. Justice Kagan, writing for six colleagues, said no. The Yearsley immunity doctrine, which shields contractors from liability for conduct "authorized and directed" by the federal government, is a defense on the merits, not an immunity from suit. That distinction matters enormously: it means the litigation proceeds, and any error can be corrected only after trial, not before.

April closed the term's procedural chapter with two more rulings. In Enbridge Energy, LP v. Nessel, a unanimous Court held that the 30-day deadline to remove a case from state to federal court cannot be extended through equitable tolling. Enbridge had waited 887 days before removing the Michigan attorney general's pipeline suit to federal court. The Court said that delay was fatal, regardless of the circumstances. And in First Choice Women's Resource Centers v. Davenport, a unanimous Court held that a pro-life nonprofit had standing to challenge a New Jersey attorney general's subpoena seeking its donor lists, finding that the demand for donor information itself constituted a present injury to First Amendment associational rights.

The CRS noted that as of the report's publication, no proposals in the 119th Congress specifically targeted the FRCP provisions at issue in these cases, though bills addressing FRCP 11 (litigation sanctions) and FRCP 23 (class actions) have been introduced.

Political Stakes

For the Administration

The Trump administration's fingerprints are visible on several of these cases, and the outcomes cut in different directions.

The GEO Group ruling is the sharpest setback. GEO Group operates private detention facilities under contract with ICE, a cornerstone of the administration's mass deportation infrastructure. The Court's refusal to allow immediate appeal of denied dismissal motions means that lawsuits challenging detention conditions will proceed to trial. That creates discovery obligations, litigation costs, and legal exposure for contractors that the administration depends on. It also means that the Yearsley immunity shield, which the administration has relied upon to protect its contractor network, offers less practical protection than the government had hoped.

The First Choice ruling, by contrast, is a clean win for the administration's priorities. The Trump administration filed an amicus brief in support of First Choice, a pro-life pregnancy center fighting a New Jersey subpoena, and argued alongside the organization at oral argument. The unanimous ruling not only vindicated that position but established a durable precedent: government demands for nonprofit donor information inflict a cognizable First Amendment injury, entitling organizations to challenge such demands in federal court immediately. The ruling has implications well beyond abortion politics, potentially shielding a wide range of conservative and religious nonprofits from state attorney general investigations.

The Chevron USA v. Plaquemines Parish ruling, which broadened the circumstances under which federal contractors can remove cases from state to federal court, also aligns with administration interests. A looser "close relationship" standard, rather than requiring direct causation between federal duties and challenged conduct, makes it easier for contractors operating under federal direction to access federal forums, where the administration generally fares better than in elected state courts.

For Congress

For a Republican-controlled Congress aligned with the administration, the CRS report functions as a legislative menu. The diversity jurisdiction statute, the federal removal statutes, and Section 1983 (the civil rights law used by First Choice to bring its federal claim) are all within Congress's reach. Lawmakers could amend them to codify favorable outcomes, expand federal contractor protections, or tighten the procedural windows available to challengers of federal policy.

Democrats, meanwhile, face a landscape in which the Court has narrowed several procedural avenues that plaintiffs and state attorneys general have historically used to challenge federal action. The Enbridge ruling's strict removal deadline, for instance, cuts against states that delay in asserting federal court jurisdiction, a dynamic that could disadvantage state-level challenges to administration policies if those states miss their window.

Whether a medical malpractice plaintiff can get into federal court, whether a detained immigrant can hold a private contractor accountable at trial, and whether a nonprofit's donor list is protected from a state subpoena are the practical outcomes of rules that most Americans never see until they need them.

The Bottom Line

The CRS report on federal civil procedure rulings from the October 2025 Supreme Court term delivers one overriding message: the Court has spent this term building walls around federal court access, around the timing of procedural challenges, and around the circumstances under which state-court cases can migrate to federal forums.

Some of those walls benefit the current administration. Some complicate its reliance on private contractors and its litigation strategy. All of them are, in principle, subject to congressional revision, and the CRS makes clear that Congress has both the authority and the precedent to act.