Removal of President from office
Section 143(2) · 1999 Constitution (2004 edition)
What Constitution says
(2) Whenever a notice of any allegation in writing signed by not less than one-third of the members of the National Assembly:- (a) is presented to the President of the Senate; (b) stating that the holder of the office of President or Vice-President is guilty of gross misconduct in the performance of the functions of his office, detailed particulars of which shall be specified, the President of the Senate shall within seven days of the receipt of the notice cause a copy thereof to be served on the holder of the office and on each member of the National Assembly, and shall also cause any statement made in reply to the allegation by the holder of the office to be served on each member of the National Assembly.
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 71–72. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections