The son of former Governor Don Siegelman has filed a lawsuit seeking Department of Justice documents about his father's prosecution. The lawsuit filed Tuesday in Birmingham federal court accuses the Department of Justice and its Office of Professional Responsibility of improperly withholding records the family has sought through public records requests. According to the lawsuit, Joseph Siegelman last year filed a records request for documents related to the office's review of prosecutors' behavior in the case. The lawsuit said the request was denied because of Freedom of Information Act exemptions for protected communications between agencies, law enforcement records and information that invades a person's privacy. A federal jury convicted Siegelman in 2006 of bribery and obstruction of justice. The former governor is serving a 6-and-a-half year prison sentence.