(a)General rule. All hearings shall be open to the public, unless the Comptroller, in the Comptroller's discretion, determines that holding an open hearing would be contrary to the public interest. Within 20 days of service of the notice or, in the case of change-in-control proceedings under section 7(j)(4) of the FDIA (12 U.S.C. 1817(j)(4) ), within 20 days from service of the hearing order, any respondent may file with the Comptroller a request for a private hearing, and any party may file a reply