WASHINGTON (AP) — A lawsuit says Transportation Secretary Anthony Foxx was paid nearly a half-million dollars by a bus company while mayor of Charlotte, North Carolina, even though he performed no work for the company.

The suit in U.S. Bankruptcy Court in North Carolina was filed by a trustee for the bankrupt bus company, DesignLine USA. The suit seeks the return of $421,000 that Foxx was paid over four years as the company’s deputy general counsel.

The suit alleges that company records don’t reflect any work performed by Foxx.

Foxx resigned from the company on July 1, 2013, the day before he became transportation secretary.

Foxx had no immediate comment Wednesday.

DesignLine made hybrid-electric buses bought by the Charlotte Douglas International Airport, which the city owns.

Foxx was mayor from 2009 to 2013.