Iowa Attorney General Brenna Bird has filed a lawsuit against Winneshiek County, challenging its sheriff’s refusal to comply with federal immigration detainer requests. The legal move follows public statements made by Sheriff Dan Marx, who has expressed concerns about the constitutionality of certain federal immigration procedures.

In court filings, Attorney General Bird argues that Marx’s stance has discouraged cooperation between local and federal authorities, potentially affecting public safety operations. At the center of the dispute are ICE detainers—requests sent by federal agents asking local law enforcement to hold individuals suspected of being in the U.S. unlawfully until federal authorities can take custody.

Sheriff Marx stated in a now-deleted social media post that these detainers, unless backed by a judicial warrant, raise constitutional concerns. He emphasized that his department would verify the legality of any federal actions but would only cooperate if the proper legal processes were followed.

“We will make every effort to ensure actions carried out in our jurisdiction are consistent with constitutional standards,” Marx wrote. “We will not act based on opinions or pressure, but on what is legally appropriate.”

Federal officials have long maintained that detainers are a key tool in immigration enforcement and community safety, but critics argue that holding individuals without warrants could violate constitutional rights.

The lawsuit marks a rare legal clash between state and local officials over how immigration enforcement should be handled on the ground. No court date has been set, and the outcome may have broader implications for how law enforcement agencies across the state navigate similar requests in the future.