; or (B) for reasons of national security. (2) The unavailability of commercially available flights, with an accompanying written finding issued on a case-by-case basis by the President or the Chief of Staff to the President, may be a permissible basis for determining the otherwise prohibited travel is necessary. Any written finding issued under the preceding sentence shall be published on the General Service Administration’s public website within 30 days of issuance, except with respect to any travel the purposes of which is classified. (3) The guidelines may not provide for any comprehensive waiver for any cabinet official. 4. Disclosure of travel by cabinet officials (a) Disclosure (1) In general Except as provided in paragraph (2), beginning on the date the guidelines are published under section 3, any travel otherwise prohibited by section 2(a) by a cabinet official shall be disclosed to the Administrator of General Services on a quarterly basis. (2) Classified travel With respect to any travel the purposes of which is classified, the travel shall be disclosed within 60 days to the Permanent Select Committee on Intelligence of the House of Representatives, the Select Committee on Intelligence of the Senate, the subcommittee on defense of the Committee on Appropriations of the House of Representatives, and the subcommittee on defense of the Committee on Appropriations of the Senate. Nothing in this Act shall be construed to supersede, alter, or otherwise affect the application of section 101–37.408 of title 41, Code of Federal Regulations, or any successor regulation. (b) Publication The Administrator shall publish detailed information, including among other pertinent information the justification for the mode of travel and the identities of all passengers, regarding any flight disclosed under subsection (a)(1) on the General Service Administration’s public website not later than 30 days after the date the Administrator receives such information.