Unless this subsection is waived by the head of a Federal agency, a person may not obtain any Federal financial assistance in the form of a loan (other than a disaster loan or a marketing assistance loan or loan deficiency payment under subtitle C of the Agricultural Market Transition Act (7 U.S.C. 7231 et seq.)) or loan insurance or guarantee administered by the agency if the person has an outstanding debt (other than a debt under the Internal Revenue Code of 1986) with any Federal agency which is in a delinquent status, as determined under standards prescribed by the Secretary of the Treasury. Such a person may obtain additional loans or loan guarantees only after such delinquency is resolved in accordance with those standards. The Secretary of the Treasury may exempt, at the request of an agency, any class of claims.