The preclusive effect of a federal judgment that confirmed an arbitration award is to be determined by arbitrators in a subsequent arbitration, not by the federal court. Citigroup, Inc. v. Abu Dhabi Inv. Auth., 776 F.3d 126 (2d Cir. 2015) (No. 13-4825-cv). The arbitrators in the first arbitration issued an arbitration award, and the prevailing party obtained confirmation of the award pursuant to the Federal Arbitration Act in district court, without the district court considering the merits of the underlying claims at issue in the arbitration. Subsequently, the losing party filed a second arbitration claim, which arguably contested the rulings in the first arbitration. The prevailing party sought to enjoin the second arbitration under the All Writs Act, arguing that the court should determine that the second arbitration was precluded by the confirmed award in the first arbitration. The district court disagreed and the court of appeals affirmed, holding that the All Writs Act does not permit a district court to enjoin an arbitration based on whatever claim-preclusive effect may result from the court’s prior judgment when that judgment merely confirmed the results of the parties’ earlier arbitration without considering the merits of the underlying claims.