Establishment and jurisdiction of election tribunals
Section 285(2) · 1999 Constitution (2004 edition)
What Constitution says
(2) There shall be established in each State of the Federation one or more election tribunals to be known as the Governorship and Legislative Houses Election Tribunals which shall, to the exclusion of any court or tribunal, have original jurisdiction to hear and determine petitions as to whether any person has been validly elected to the office of Governor or Deputy Governor or as a member of any legislative house.
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 117–118. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections