Election: two or more presidential candidates
Section 134(3) · 1999 Constitution (2004 edition)
What Constitution says
(3) In a default of a candidate duly elected in accordance with subsection (2) of this section their shall be a second election in accordance with subsection (4) of this section at which the only candidate shall be - (a) the candidate who scored the highest number of votes at any election held in accordance with the said subsection (2) of this section; and (b) one among the remaining candidates who has a majority of votes in the highest number of States, so however that where there are more than one candidate with majority of votes in the highest number of States, the candidate among them with the highest total of votes cast at the election shall be the second candidate for the election.
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 68. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections