25 C.F.R. § 1000.235
Under § 1000.205, a Tribe may withdraw from a Consortium and request that the Secretary award the Tribe its portion of a construction project's funds. The Secretary may decide not to award these funds if the Secretary determines that the award of the withdrawing Tribe's portion of funds would affect the ability of the remaining members of the Consortium to complete a severable or non-severable phase of the project within available funding.