Section 58Omnibus Election Code of the Philippines (Batas Pambansa Blg. 881), Sec. 58

Disqualifications of members of the Commission. - The chairman and members of the Commission shall be subject to the canons of judicial ethics in the discharge of their functions.

No chairman or commissioner shall sit in any case in which he has manifested bias or prejudice for or against or antagonism against any party thereto and in connection therewith, or in any case in which he would be disqualified under the Rules of Court. If it be claimed that the chairman or a commissioner is disqualified as above provided, the party objecting to his competency may file his objection in writing with the Commission stating the ground therefor. The official concerned shall continue to participate in the hearing or withdrawn therefrom in accordance with his determination of the question of his disqualification. The decision shall forthwith be made in writing and filed with the other papers of the case in accordance with the Rules of Court.

If a disqualification should result in a lack of quorum in the Commission sitting en banc, the Presiding Justice of the Intermediate Appellate Court shall designate a justice of said court to sit in said case for the purpose of hearing and reaching a decision thereon.