The Debate Over Whether Congress Can — and Should — Ban Sanctuary Cities

The question of whether Congress has the constitutional authority — and the practical justification — to ban sanctuary cities has resurfaced in a new debate between legal scholars Rick Rosen and Charles Moster.

Sanctuary cities, broadly defined, are jurisdictions that limit their cooperation with federal immigration enforcement agencies. These policies vary widely: some cities refuse to hold detainees beyond their release date for immigration authorities, while others restrict information sharing with federal agents. Proponents argue these policies foster trust between immigrant communities and local law enforcement, encouraging crime reporting and public safety cooperation. Critics contend they undermine the rule of law and create safe havens for individuals who have violated immigration statutes.

The constitutional question centers on the Tenth Amendment and the principle of anti-commandeering — the idea that the federal government cannot compel states or localities to enforce federal law. The Supreme Court has affirmed this principle in several rulings, most notably in cases involving federal conditions on state spending. However, Congress retains the power of the purse and could theoretically attach conditions to federal funding to incentivize compliance with immigration enforcement.

Rosen and Moster approach the issue from different angles. One examines whether congressional action would survive judicial scrutiny, while the other weighs the policy merits of a uniform national approach versus local autonomy. The debate highlights a tension that has persisted for decades: the balance of power between federal directives and local governance.

Several administrations have attempted to leverage federal funding to pressure sanctuary jurisdictions, with mixed results in the courts. Executive orders threatening to withhold grants have faced injunctions, and legislative efforts have stalled in Congress amid partisan divisions.

The debate also touches on public safety data. Studies on whether sanctuary policies correlate with lower or higher crime rates have produced conflicting conclusions, making empirical arguments difficult to settle definitively.

What This Means For You: The sanctuary city debate could directly affect how your local police interact with federal immigration authorities. If Congress successfully passes legislation banning sanctuary policies, your city or state may be required to change its current cooperation rules — or risk losing federal funding. Regardless of where you stand on immigration, this is a fight over who controls local law enforcement priorities: Washington or your hometown.