A Wisconsin federal district court has held that it may not interfere with an insurance rehabilitation case proceeding in state court. On January 18, 2011, the federal court ruled that it lacked jurisdiction to consider the legality of a state court’s order made in the context of an insurance rehabilitation proceeding. The state court enjoined the United States from taking certain actions against the claims-paying assets of the segregated accounts of Ambac Assurance. Shortly thereafter, the United States commenced a collateral attack against the state court and others, seeking to enjoin the state court from enforcing its rehabilitation plan or any injunction insofar as it affected the United States. The federal court once again ruled it lacked jurisdiction, holding that the McCarran-Ferguson Act “reverse-preempted” I.R.C. § 7401 (which authorizes injunctions for enforcement of internal revenue laws), the federal-question statute, and the federal-tax-issue jurisdiction statute. An injunction would “impair” or “supersede” state laws authorizing the state court to issue rehabilitation orders. The court also rejected the United States’ argument that the McCarran-Ferguson Act cannot preempt sovereign immunity. The case was dismissed for lack of subject matter jurisdiction.United States v. Wisconsin State Circuit Court for Dane County, Case No. 11-99 (USDC W.D. Wis. Feb. 18, 2011).