Supremacy of constitution
Section 1(2) · 1999 Constitution (2004 edition)
What Constitution says
(2) The Federal Republic of Nigeria shall not be governed, nor shall any persons or group of persons take control of the Government of Nigeria or any part thereof, except in accordance with the provisions of this Constitution.
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 17. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections