by the United States government

“ Except with respect to a deposit or investment that is insured or guaranteed by the United States or by a department, agency, or instrumentality of the United States or backed by the full faith and credit of the United States, the trustee shall require from an entity with which such money is deposited or invested— (1) a bond— (A) in favor of the United States; (B) secured by the undertaking of a corporate surety approved by the United States trustee for the district in which the case is pending ”