25 U.S.C. § 566b - Conservation and development of lands

(a) In general 
Notwithstanding the tribes previous rejection of the Act of June 18, 1934 (25 U.S.C. 461 et seq.), upon written request of the General Council, the Secretary of the Interior shall conduct a special election pursuant to section 18 of such Act [25 U.S.C. 478] to determine if such Act should be applicable to the tribe.

(b) Adoption of constitution 
Upon written request of the General Council, the Secretary shall conduct an election pursuant to section 16 of the Act approved on June 18, 1934 (43 Stat. 987; 25 U.S.C. 476), for the purpose of adopting a new constitution for the tribe.