25 CFR § 900.24
Can a contract proposal for an Indian tribe or tribal organization's share of administrative programs, functions, services, and activities be declined for any reason other than the five reasons specified in §900.22?
February 24, 2021
No. The Secretary may only decline a proposal based upon one or more of the five reasons listed above. If a contract affects the preexisting level of services to any other tribe, the Secretary shall address that effect in the Secretary's annual report to Congress under section 106(c)(6) of the Act.