20 days prior to waiving, under his or her statutory authority, any applicable Buy American Law, the head of an executive agency shall submit to the Administrator of General Services a copy of the request and information available to the executive agency concerning the request. Not later than 5 days after receiving this information from the head of an executive agency, the Administrator of General Services shall make available to the public, by posting on the website established under subsection (a), a copy of the request and information available to the executive agency concerning the request, and shall allow for informal public comment on the request for at least 15 days prior to making a finding based on the request. (d) Information available to the executive agency concerning the request (1) Requirement No requested waiver of an applicable Buy American Law may be granted if, in contravention of subsection (c)— (A) the request was not made available to the public