The City of Chicago has joined a coalition of sanctuary cities and local governments in a federal lawsuit challenging the Trump administration's efforts to withhold federal funding from municipalities that limit cooperation between local law enforcement and federal immigration authorities. This legal action opposes the administration's attempts to defund and prosecute sanctuary cities, which are jurisdictions that adopt policies to protect undocumented immigrants by restricting local enforcement of federal immigration laws. The lawsuit includes multiple jurisdictions, with additional cities and counties from the Bay Area also joining the challenge against the administration's crackdown on sanctuary policies.