Except as provided in subsection (b), and notwithstanding any other provision of law, for any procurement related to a major disaster, the Administrator may, upon such terms and conditions as the Administrator may prescribe, guarantee and enter into commitments to guarantee any surety against loss resulting from a breach of the terms of a bid bond, payment bond, performance bond, or bonds ancillary thereto, by a principal on any total work order or contract amount at the time of bond execution that does not exceed $5,000,000.