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

# Why This Matters

California spent four years building a legal fortress around its sanctuary city policies, culminating in the 2021 "Immigrant Worker Protection Act"—the formal name for what became known as the "No Vigilantes Act." The law prohibited state law enforcement from cooperating with federal Immigration and Customs Enforcement agents, barred ICE from using state databases, and restricted ICE access to courthouses and county jails. Newsom's administration defended it as protecting immigrant communities from aggressive deportation tactics. On Monday, a three-judge Ninth Circuit panel—composed entirely of Democratic appointees—unanimously demolished it anyway, ruling that federal immigration authority under the Supremacy Clause cannot be blocked by state law, no matter how well-intentioned.

The stakes are immediate and concrete. County sheriffs and police departments across California have been operating under constraints that just evaporated. A county jail that previously had to keep ICE agents out of holding areas now faces no legal bar to allowing them access. Undocumented immigrants scheduled for routine court appearances—traffic violations, misdemeanor cases—can no longer rely on courthouse immunity. The law protected roughly 2.6 million undocumented immigrants in California, according to state estimates. That protection just failed its constitutional test. Immigration advocacy groups are already signaling appeals, but the panel's unanimity suggests the legal ground has shifted permanently.

This is textbook Supremacy Clause doctrine with no modern precedent needed—the Constitution settled this in 1819. When federal and state law conflict on matters of federal power, the federal law wins. Immigration is explicitly federal jurisdiction. What makes this ruling notable is not the legal principle but the political inversion: California's Democratic-dominated legislature and executive branch spent millions defending a position they lost 3-0 to judges they expected to align with their worldview. The Ninth Circuit, which has blocked numerous Trump-era immigration policies, found no wiggle room here because the Constitution doesn't offer one.

The conservative case is simple and unanswerable: California tried to veto federal immigration law. States don't get that power. Newsom's administration dressed it up in sanctuary language, but the mechanism was state obstruction of federal agents doing federal work. Courts cannot overturn the Supremacy Clause because the cause is sympathetic. The ruling doesn't say California must cooperate with ICE; it says California cannot legally forbid cooperation. That's the floor, not the ceiling. If Newsom wanted to restrict ICE activity, he needed a federal fix, not a state prohibition on a federal function.

What happens now: California's attorney general Rob Bonta is expected to petition for an en banc rehearing before the full Ninth Circuit—a longer shot but mandatory if they want appellate options before Supreme Court consideration. The Biden administration, which had sided with California during litigation, is unlikely to appeal further. More immediately, counties will begin updating their law enforcement protocols within weeks. The real test comes if ICE actually increases courthouse operations or jail access—whether immigration attorneys can still physically prevent agents from encountering clients, and whether any California official chooses to violate the ruling to defend the old sanctuary position.