Gavin Newsom’s legislative minions just got a lesson in constitutional supremacy

California passed what it called the "Judicial Council Accountability Act" in 2017, but it functioned as the "No Vigilantes Act" in practice: the law prohibited state and local law enforcement from assisting federal immigration agents without a judicial warrant, even when ICE was executing deportation orders. The statute created a wall between state police and federal immigration enforcement, reflecting California's sanctuary state posture. Last week, a three-judge panel of the Ninth Circuit Court of Appeals—traditionally favorable to progressive causes—unanimously struck it down on grounds that federal immigration law preempts state attempts to restrict federal agents' operations. The decision invokes the Supremacy Clause, the constitutional principle that federal law trumps conflicting state law.

What's actually at stake is California's ability to impose operational constraints on federal enforcement within its borders. Under the old law, ICE agents could still arrest people for immigration violations, but state cops couldn't be compelled to assist them—couldn't hold detainees, couldn't provide information, couldn't coordinate operations. That created practical friction: federal agents operating solo in a state hostile to their mission. The ruling means ICE can now reasonably expect state and local cooperation, or at minimum, that California cannot legally forbid it. For undocumented immigrants, this removes a shield that had real consequences. For ICE, it's a significant operational win in one of the nation's largest states.

The conservative read here is straightforward: a state cannot constitutionally declare war on federal law enforcement. Newsom's legislature attempted an end-run around federal immigration authority by weaponizing state police as non-compliance—essentially saying federal immigration law is valid, we just won't help enforce it, and we'll legally forbid our officers from helping. The Ninth Circuit said no. This isn't judicial overreach. This is the Constitution working as written. A state doesn't get to nullify federal statutes by simply refusing to participate and criminalizing participation. If California dislikes federal immigration law, it can lobby Congress or the President. It cannot use its law enforcement apparatus as a vehicle for systematic non-cooperation with lawfully executed federal warrants.

The precedent runs deep. Since the Civil War, courts have held that states cannot obstruct federal authority within their borders. During Reconstruction, the Supreme Court struck down state laws designed to resist federal enforcement. More recently, in *New York v. United States* (1992), the Court ruled that states cannot be commandeered to enforce federal law—but the inverse also holds: they cannot be commandeered to *prevent* federal law from functioning. California's gambit was the mirror image: use state authority to cripple federal operations. The Ninth Circuit's unanimous decision suggests there's no real legal daylight here, even among judges generally sympathetic to California's immigration politics.

Watch for California's next move carefully. The state could petition for en banc review before the full Ninth Circuit (unlikely to succeed given the panel's unanimity). It could appeal to the Supreme Court, though SCOTUS rarely takes immigration preemption cases unless there's a circuit split, and this ruling aligns with established doctrine. More likely, Newsom's legislature will probe the ruling's boundaries—drafting new language that stops short of explicitly forbidding cooperation while creating practical obstacles to it. The real test comes when ICE actually tries to coordinate with California law enforcement under the new legal regime. That's when we'll see if the Ninth Circuit's decision produces actual operational change or remains symbolically important but practically limited.