— The NFL Players Association has filed a federal lawsuit for Adrian Peterson, asking the court to dismiss an arbitrator’s decision to uphold the NFL’s punishment of the star running back.

The petition was filed Monday in Minnesota, where the NFLPA has often gone to contest labor matters with the league.

Peterson was suspended without pay for the remaining six games of this season by Commissioner Roger Goodell as a result of the child-abuse case that has kept the six-time Pro Bowl pick out of all but one game this year. Arbitrator Harold Henderson on Friday affirmed the penalty issued by Goodell, which Peterson appealed.

The union argued that Henderson’s decision was biased, unfair and contrary to the collective bargaining agreement.