Constitution and rules of political parties
Section 223(1) · 1999 Constitution (2004 edition)
What Constitution says
(1) The constitution and rules of a political party shall- (a) provide for the periodical election on a democratic basis of the principal officers and members of the executive committee or other governing body of the political party; and (b) ensure that the members of the executive committee or other governing body of the political party reflect the federal character of Nigeria.
This is the 1999 Constitution as published in 2004. Later amendments aren't included yet, so a section may have changed since.
Original source
Official Gazette · CFRN 1999 official PDF · printed page 98–99. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections