Discharge of functions of President
Section 146(1) · 1999 Constitution (2004 edition)
What Constitution says
(1) The Vice-President shall hold the office of President if the office of President becomes vacant by reason of death or resignation, impeachment, permanent incapacity or the removal of the President from office for any other reason in accordance with section 143 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 73–74. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections