The ruling highlights ongoing tensions between state immigration policies and federal enforcement, signaling further litigation is likely.

The court agreed the measure attempts to directly regulate the federal government in performing its functions, raising constitutional concerns.

The three-judge panel hearing the case included Judge Bennett (Trump appointee), Judge Collins (Trump appointee), and Judge Nguyen (Obama appointee).

Judge Bennett wrote that the law attempts to regulate the federal government’s operations, which the court deemed unconstitutional, reflecting bipartisan judicial sentiment on the panel.

The injunction prevents the California requirement from taking effect while the case proceeds.

A federal appeals court in the Ninth Circuit blocked California's law that would require federal immigration agents to wear identification, with the injunction remaining pending appeal after an initial ruling.

California argued the law would apply impartially to all law enforcement and improve public safety, with exceptions for undercover work, protective gear, and certain operational scenarios.

The Trump administration sued California in November 2025, arguing the law would endanger officers and improperly encroach on federal sovereignty under the Supremacy Clause, citing risks of harassment and violence against agents.

Reaction from officials included First Assistant U.S. Attorney Bill Essayli calling the ruling a “huge legal victory,” while California Attorney General Rob Bonta said the state is reviewing the order and reaffirmed transparency in law enforcement.

Enacted in 2025, the law aimed to increase transparency about federal officers’ activities but faced opposition from the Trump administration on security and constitutional grounds.

The court did not evaluate public safety factors beyond constitutional concerns, stating the federal government’s constitutional rights would be violated if the law stood.

The decision could have nationwide implications for similar state efforts to regulate or restrict federal immigration enforcement actions and signals limits on state power to regulate federal operations.