BISMARCK, N.D. — Federal prosecutors say a convicted con man accused of passing himself off as an FBI agent in the North Dakota oil patch is wanted on a warrant in Tennessee and should not be released before sentencing.

Steven Goldmann pleaded guilty in February to an illegal weapons charge, after federal authorities agreed to drop four counts of impersonating an officer. Authorities say he regularly displayed a badge and gun.

A defense attorney says Goldmann suffers from post-traumatic stress disorder as a result of his Air Force service in Iraq and should be allowed to seek treatment in St. Cloud, Minnesota before his Sept. 25 sentencing.

The government says Goldmann has yet to answer to an amended warrant in Tennessee, where he was convicted in 2013 on a theft of services charge.