Federal Appeals Court Rulings Show Legal Patchwork on Key Issues

Why It Matters

Federal appeals court decisions where circuits have reached conflicting conclusions on the same questions of federal law create a legal patchwork that treats similarly situated Americans differently depending on their zip code.

A new Congressional Research Service legal report published June 10, part of the recurring Congressional Court Watcher series, maps the most consequential circuit splits from May. The fault lines it identifies cut directly through some of the most contested policy battles of the current moment, including immigration detention, gun rights, labor enforcement, and wireless infrastructure.

The Big Picture

Why Circuit Splits Matter to Lawmakers

The thirteen U.S. Courts of Appeals issue thousands of precedent-setting decisions each year, and the Supreme Court reviews only a fraction of them. When appellate court splits emerge, federal law effectively operates differently across the country until the Supreme Court steps in, or until Congress acts. The CRS report focuses specifically on splits relevant to Congress's lawmaking and oversight functions, including eight conflicts spanning civil procedure, communications law, firearms, immigration, and labor.

Immigration: The Highest-Stakes Conflict

The most politically charged of the circuit court conflicts involves who can be held without bond during immigration removal proceedings. Under 8 U.S.C. § 1225(b)(2)(A), aliens who are "applicants for admission" and not "clearly and beyond a doubt entitled to be admitted" must be detained during removal proceedings. The statute separately provides that aliens "present in the United States who have not been admitted" are treated as applicants for admission, but does not define who counts as "seeking admission."

The Fifth and Eighth Circuits have treated those two terms as synonymous, meaning all unlawfully present aliens are subject to mandatory detention. In May, divided panels of the Sixth Circuit in Lopez-Campos v. Raycraft, and the Eleventh Circuit in Hernandez Alvarez v. Warden, Federal Detention Center Miami, rejected that reading. Both joined the Second Circuit in holding that mandatory detention applies only to those unlawfully present aliens who are actively seeking lawful admission, not to everyone who entered illegally years ago.

The Seventh Circuit's position is unresolved. In Castañon Nava v. U.S. Department of Homeland Security, a fractured panel vacated an earlier decision that had sided with the narrower interpretation, then affirmed and reversed portions of lower court orders without settling the statutory question.

A second immigration split involves what criminal defense attorneys must tell naturalized citizen clients. The Sixth Circuit held that the Sixth Amendment does not require defense counsel to warn a naturalized citizen that a guilty plea could lead to denaturalization. The Second Circuit has extended the Supreme Court's Padilla v. Kentucky ruling to require exactly that warning. The result is that a naturalized citizen's constitutional protections at the moment of a plea depend on which circuit they are in.

Firearms: A Post-Bruen Battleground

The Second Circuit's May 2026 decision in Christian v. James and Boron v. James struck down portions of New York's firearms statute as applied to private property open to the public, including gas stations and grocery stores. Applying the framework from New York State Rifle & Pistol Association, Inc. v. Bruen, the panel majority concluded that the historical analogues cited by the Ninth Circuit in a parallel case involving a different state's law were not sufficiently close to establish a national tradition of restricting firearms on such property.

The split between the Second and Ninth Circuits on what qualifies as a valid historical analogue under Bruen is now one of the cleaner circuit court conflicts over the Second Amendment, and one likely to require Supreme Court resolution.

Labor: Raising the Bar on the NLRB

In Kerwin v. Trinity Health Grand Haven Hosp., a divided Sixth Circuit held that when the National Labor Relations Board (NLRB) seeks a preliminary injunction under 29 U.S.C. § 160(j), courts cannot simply infer irreparable harm from an employer's refusal to bargain. The Board must show "certain and immediate" harm through actual factual support. The Ninth Circuit has allowed courts to infer irreparable harm from a failure to bargain in good faith, combined with permissible inferences about likely effects.

The Sixth Circuit's ruling raises the evidentiary threshold the NLRB must clear to obtain emergency relief in that jurisdiction, a meaningful constraint on one of the Board's core enforcement tools.

Wireless Infrastructure: Local Authority vs. Federal Preemption

The Eleventh Circuit's reading of 47 U.S.C. § 332(c)(7)(B)(i), the Telecommunications Act provision limiting state and local regulation of wireless facility siting, narrows federal preemption to general zoning rules rather than individual permit decisions. Under that reading, a municipality can deny a single permit for a wireless facility without triggering a federal statutory violation. The First, Second, Sixth, Seventh, and Ninth Circuits have held the opposite, applying the "significant gap" test that can find a statutory violation in the denial of a single permit if it effectively prohibits wireless service coverage.

Political Stakes

For the Administration

The mandatory detention split is the most direct collision with the administration's immigration enforcement policies. The Trump administration has sought to maximize detention of undocumented immigrants during removal proceedings. The Sixth and Eleventh Circuit rulings limiting that authority to those actively seeking admission, rather than all unlawfully present individuals, constrain that posture in those jurisdictions. The Fifth and Eighth Circuits' broader reading still supports the administration's position, but the geographic inconsistency undercuts a uniform national enforcement strategy.

The denaturalization warning split carries a related significance. The administration has expressed interest in denaturalization proceedings against naturalized citizens convicted of crimes. In circuits that do not require defense attorneys to warn clients of denaturalization risks, naturalized citizens may be less likely to factor that consequence into plea decisions, potentially making post-conviction denaturalization proceedings more viable.

On labor, the Sixth Circuit's higher bar for NLRB preliminary injunctions aligns with the administration's skepticism toward the Board's authority. A more demanding irreparable harm standard limits the NLRB's ability to obtain emergency relief quickly in labor disputes within that circuit.

For Congress

Each of the splits identified in the CRS report represents a potential legislative opening. Congress could resolve the mandatory detention ambiguity in 8 U.S.C. § 1225(b)(2)(A) by clarifying the definition of "alien seeking admission." It could address the Fair Labor Standards Act (FLSA) jurisdictional split, where the Second Circuit joined the Third, Sixth, Seventh, Eighth, and Ninth Circuits in applying Bristol-Myers Squibb's claim-by-claim analysis to collective actions, while the First Circuit has declined to do so. It could also clarify the scope of federal preemption under the Telecommunications Act to resolve the five-circuit conflict over individual wireless permit denials.

Democrats and Republicans are likely to draw opposite conclusions about which splits warrant legislative action and in which direction, but the report itself is nonpartisan in its function. It is a map of where federal law is currently broken.

The Bottom Line

The immigration detention conflict alone affects how many people can be held without bond across the country, and the administration's enforcement capacity varies materially depending on which circuit has jurisdiction. The firearms split deepens an already unsettled post-Bruen landscape that the Supreme Court will eventually have to address. For Congress, the report is a practical checklist of statutory ambiguities that the courts have been unable to resolve uniformly.

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