25 CFR §81.57

1. (a)For a tribe whose governing document or charter of incorporation provides for petitioning the Secretary to call a Secretarial election:
   1. (1)The spokesperson for the petitioners may ask the tribe or the Local Bureau Official how many signatures are required.
   2. (2)The Local Bureau Official will:
      1. (i)Contact the tribal governing body to obtain the current number of tribal members, 18 years of age or older, to determine the number of tribal members who must sign a petition as required by the tribe's governing document; and
      2. (ii)Notify the petitioners' spokesperson how many signatures are required and that the number is valid for 180 days from the date of this notification.
2. (b)For a federally recognized tribe adopting a governing document under Federal statute for the first time, the petition must have signatures of 50 percent of the tribal members who are 18 years of age or older.