Power to make regulations
Section 32(1) · 1999 Constitution (2004 edition)
What Constitution says
(1) The president may make regulations, not inconsistent with this Chapter, prescribing all matters which are required or permitted to be prescribed or which are necessary or convenient to be prescribed for carrying out or giving effect to the provisions of this Chapter, and for granting special immigrant status with full residential rights to non- Nigerian spouses of citizens of Nigeria who do not wish to acquire Nigerian citizenship.
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 33. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections