The NFL Players Association filed a lawsuit Monday in U.S. district court on behalf of Adrian Peterson to fight his suspension. The suit challenges arbitrator Harold Henderson’s decision to uphold Peterson’s suspension, claiming it was biased and unfair. A Nov. 12 phone call between Troy Vincent and Peterson revealed that the NFL executive promised the Minnesota Viking that he would be in reinstated after two games with the pledge that he’d attend a meeting with Commissioner Roger Goodell. Peterson declined attending the meeting, which the NFLPA argues was used against him. However, the NFL argued that Vincent didn’t promise anything specifically. Peterson was suspended after being indicted for child abuse in Texas. He pleaded no contest to a misdemeanor.