FRANKFORT, Ky. — The owners of Maximum Security have sued the Kentucky Horse Racing Commission and race stewards, seeking to reverse the horse’s disqualification for interference as Kentucky Derby winner and restoration of purse money.

The lawsuit filed by Gary and Mary West on Tuesday in U.S. District Court says that stewards relied on insubstantial evidence and questioned a “bizarre and unconstitutional” process before and after the disqualification. Maximum Security crossed the finish line first on May 4 before being disqualified and dropping to 17th for impeding the paths of several horses.

The KHRC last week denied an appeal of the disqualification and said that the stewards’ decision was not subject to appeal. The lawsuit says that due process was denied along with the winner’s purse.