20 C.F.R. § 402.110
U.S. District Court action
If the Executive Director for OPD or the Executive Director for OPD's designee, upon review, affirms the denial of the FOIA Officer's determination of items specified in § 402.50(a), requesters may ask a U.S. District Court to review that denial. See 5 U.S.C. 552(a)(4)(B).