The National Assembly shall by an Act make provisions as respects -
(a) persons who may apply to the Court of Appeal for the determination of any question as to whether;
(i) any person has been validly elected to the office of President or Vice-President
(ii) the term of office of the President or Vice President has cease, or
(iii) the office of the President or Vice-President has become vacant
(b) circumstances and manner in which, and the conditions upon which such application may be made; and
(c) powers, practice and procedure of the Court of Appeal in relation to any such application.
Section 139 of the Constitution of the Federal Republic of Nigeria