25 U.S. Code § 2704 - National Indian Gaming Commission
There is established within the Department of the Interior a Commission to be known as the National Indian Gaming Commission.
Vacancies occurring on the Commission shall be filled in the same manner as the original appointment. A member may serve after the expiration of his term of office until his successor has been appointed, unless the member has been removed for cause under subsection (b)(6).
Two members of the Commission, at least one of which is the Chairman or Vice Chairman, shall constitute a quorum.
The Commission shall select, by majority vote, one of the members of the Commission to serve as Vice Chairman. The Vice Chairman shall serve as Chairman during meetings of the Commission in the absence of the Chairman.
The Commission shall meet at the call of the Chairman or a majority of its members, but shall meet at least once every 4 months.