Banned sprinter Justin Gatlin has filed a lawsuit in a last-ditch effort to compete at the U.S. Olympic track and field trials in less than three weeks.

The suit was filed Monday in U.S. District Court in his hometown of Pensacola, Fla. It alleges penalizing Gatlin for a 2001 doping violation that involved medication he was taking for attention deficit disorder is a violation of the Americans with Disability Act.

It comes just three days after the Court of Arbitration for Sport upheld a four-year doping ban against the reigning Olympic 100-meter gold medalist. Gatlin sought to have the 2001 doping violation — the first of two — rescinded, which he had hoped would reduce his ban and make him eligible to compete at the trials, which begin June 27.