42 U.S.C. § 4526

Insofar as they relate to any guarantees, loans, or grants made pursuant to this part, the financial transactions of recipients of Federal assistance may be audited by the Government Accountability Office under such rules and regulations as may be prescribed by the Comptroller General of the United States. The representatives of the Government Accountability Office shall have access to all books, accounts, records, reports, files and all other papers, things, or property belonging to or in use by such recipients pertaining to such financial transactions and necessary to facilitate the audit.