The NFL Players Association told a federal appeals court Monday that League Commissioner Roger Goodell violated labor and arbitration law by suspending quarterback Tom Brady for an alleged football tampering scheme.

In the latest salvo over the deflation of footballs before the New England Patriots-Indianapolis Colts playoff game in January, lawyers for the players union urged the U.S. Court of Appeals for the Second Circuit to reject the NFL’s appeal filed in October and affirm the decision of Southern District Judge Richard Berman vacating Goodell’s four-game suspension of Brady.