(1) A member of the Senate or of the House of Representatives shall vacate his seat in the House of which he is a member if -
(a) he becomes a member of another legislative house.
(b) any other circumstances arise that, if he were not a member of the Senate or the House of Representatives, would cause him to be disqualified for election as a member;
(c) he ceases to be a citizen of Nigeria;
(d) he becomes President, Vice-President, Governor, Deputy Governor or a Minister of the Government of the Federation or a Commissioner of the Government of a State or a Special Adviser.
(e) save as otherwise prescribed by this Constitution, he becomes a member of a commission or other body established by this Constitution or by any other law.
(f) without just cause he is absent from meetings of the House of which he is a member for a period amounting in the aggregate to more than one-third of the total number of days during which the House meets in any one year;
(g) being a person whose election to the House was sponsored by a political party, he becomes a member of another political party before the expiration of the period for which that House was elected;
Provided that his membership of the latter political party is not as a result of a division in the political party of which he was previously a member or of a merger of two or more political parties or factions by one of which he was previously sponsored; or
(h) the President of the Senate or, as the case may be, the Speaker of the House of Representatives receives a certificate under the hand of the Chairman of the Independent National Electoral Commission stating that the provisions of section 69 of this Constitution have been complied with in respect of the recall of that member.
(2) The President of the Senate or the Speaker of the House of Representatives, as the case may be, shall give effect to the provisions of subsection (1) of this section, so however that the President of the Senate or the Speaker of the House of Representatives or a member shall first present evidence satisfactory to the House concerned that any of the provisions of that subsection has become applicable in respect of that member.
(3) A member of the Senate or of the House of Representatives shall be deemed to be absent without just cause from a meeting of the House of which he is a member, unless the person presiding certifies in writing that he is satisfied that the absence of the member from the meeting was for a just cause.
Section 68 of the Constitution of the Federal Republic of Nigeria