Stop Dangerous Sanctuary Cities Act

HR 3881, the "Stop Dangerous Sanctuary Cities Act," denies certain federal grants to states or localities that restrict sharing immigration status information or comply with federal immigration detainers. Specifically, it defines "sanctuary jurisdictions" as those with policies prohibiting cooperation with federal immigration enforcement requests (under Sections 236/287 of the Immigration and Nationality Act). The bill blocks recipients from receiving Economic Development Administration grants and Community Development Block Grants if they are deemed a sanctuary jurisdiction. Local officials complying with federal detainers gain legal protections, including immunity from lawsuits, while jurisdictions violating the law face mandatory return of funds. The policy takes effect October 1, 2025.