Section 20: Tenure of seat of members.

(1) A member of a House of Assembly shall vacate his seat in the House if-
(a) he becomes a member of another legislative house ;
(b) any other circumstances arise that, if he were not a member of that House, would cause him to be disqualified for election as such 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 another State, Chairman, Vice Chairman or Councilor of a Local Government.
(e)
save as otherwise provided by this Act, he becomes a member of a Commission or other body established by this Act or any other law ;
(f) without just cause, he is absent from sittings of the House of Assembly for a period amounting in the aggregate to more than one-sixth of the total number of days during which the House sits in anyone year ;
(g) being a person whose election to the House of Assembly was sponsored by one political party, he resigns from that political party or he becomes a member of the other political party before the expiration of the period for which that House was elected;
(h) he becomes a member of a secret society; or
(i) the Speaker of the House of Assembly receives a certificate under the hand of the Chairman of the National Electoral Commission stating that the provisions of section 22 of this Decree have been complied within respect of the recall of that member.
(2) The Speaker of the House of Assembly shall give effect to subsection (1) of this section, so however that the Speaker or a member shall first present evidence satisfactory to the House that any of the provisions of that subsection has become applicable in respect of that member.
(3) A member of a House of Assembly shall be deemed to be absent without just cause from a sitting of the House of Assembly 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 or was excusable.