News - U.S. Government Seeks to Influence Wisconsin ICE Detainer Lawsuit

In a significant legal move, the U.S. Department of Justice has submitted a motion to intervene in a complex case under review by the Wisconsin Supreme Court, challenging the legality of Immigration and Customs Enforcement (ICE) detainers within the state. The motion, filed by U.S. Assistant Attorney General Brett A. Shumate and his team, emphasizes the federal government's critical interest in preserving federal detainers and the underlying cooperative agreements with local law enforcement. The case originated in September 2025, when the American Civil Liberties Union of Wisconsin, representing the advocacy group Voces de la Frontera, filed a lawsuit against five Wisconsin county sheriffs. These sheriffs – Dave Gerber (Walworth County), Todd Delain (Brown County), Chad Billeb (Marathon County), David Zoerner (Kenosha County), and Chip Meister (Sauk County) – have collaborated with ICE by detaining immigrants upon federal request. This collaboration, known as ICE detainers, has sparked legal controversy as the state Supreme Court initially agreed to review the case, a decision made in December 2025. Meanwhile, the sheriffs involved are advocating for a federal jurisdiction, challenging a remand order issued by U.S. District Judge William Conley. This order transferred the case back to the state’s highest court after an initial federal review failed to establish jurisdiction. The ongoing process has seen the sheriffs filing an appeal against Judge Conley's decision with the 7th Circuit Court of Appeals, creating a dual-path legal battle—state and federal—which adds a layer of complexity to the proceedings. As the case continues, changes within the Wisconsin Supreme Court are likely to influence its direction. Recently confirmed Justice Chris Taylor is expected to join the liberal-majority court in August, shifting the dynamic to a 5-2 advantage that may impact the final verdict. The federal government’s late-stage intervention underscores its vested interest in maintaining the validity and enforcement of ICE detainers, setting the stage for a potentially precedent-setting decision that could affect immigration enforcement at both state and national levels. With legal motions pending and political dynamics shifting, this high-profile case remains a focal point for debate on the balance between state authority and federal immigration control across the nation.