On March 31, 2022, the US Supreme Court issued a significant decision in Badgerow v. Walters, No. 20-1143, ending a circuit split about when federal courts have subject matter jurisdiction to review domestic arbitration awards under the Federal Arbitration Act (FAA). In an 8-1 opinion, the Court ruled that federal courts cannot “look through” to the underlying controversy to establish subject matter jurisdiction to confirm or vacate an arbitral award under the FAA. As a result, absent diversity of citizenship, petitioners seeking to confirm or vacate domestic arbitration awards under the FAA must now bring those petitions in state court.