“Sanctuary” Jurisdictions: Federal, State, and Local Policies and Related Litigation

"There is no official or agreed-upon definition of what constitutes a “sanctuary” jurisdiction, and there has been debate as to whether the term applies to particular states and localities. Moreover, state and local jurisdictions have varied reasons for opting not to cooperate with federal immigration enforcement efforts, including reasons not necessarily motivated by disagreement with federal policies, such as concern about potential civil liability or the costs associated with assisting federal efforts. But traditional sanctuary policies are often described as falling under one of three categories. First, so-called “don’t enforce” policies generally bar state or local police from assisting federal immigration authorities. Second, “don’t ask” policies generally bar certain state or local officials from inquiring into a person’s immigration status. Third, “don’t tell” policies typically restrict information sharing between state or local law enforcement and federal immigration authorities.

One legal question relevant to sanctuary policies is the extent to which states, as sovereign entities, may decline to assist in federal immigration enforcement, and the degree to which the federal government can stop state measures that undermine federal objectives. The Tenth Amendment preserves the states’ broad police powers, and states have frequently enacted measures that, directly or indirectly, address aliens residing in their communities. Under the doctrine of preemption—derived from the Supremacy Clause—Congress may displace many state or local laws pertaining to immigration. But not every state or local law touching on immigration matters is necessarily preempted; the measure must interfere with, or be contrary to, federal law to be rendered unenforceable. Further, the anti-commandeering doctrine, rooted in the Constitution's allocation of powers between the federal government and the states, prohibits Congress from forcing state entities to perform regulatory functions on the federal government's behalf, including in the context of immigration. A series of Supreme Court cases inform the boundaries of preemption and the anti-commandeering doctrine, with the Court most recently opining on the issue in Murphy v. NCAA..."
Sanctuary