40 (1) loss of membership of the House of which he or she is a member; (2) resignation; (3) holding the position of Prime Minister, Minister or other political official; (4) being sentenced by a judgment to imprisonment, notwithstanding the non-finality of the case or the suspension of sentence, except for an offence committed through negligence, a petty offence or a defamation offence. Section 119. The President of the House of Representatives and the President of the Senate have the duties and powers to carry out the business of each House in accordance with its rules of procedure. The Vice-Presidents have the duties and powers as entrusted by the President, and perform duties on behalf of the President when the President is not present or unable to perform his or her duties. The President of the House of Representatives, the President of the Senate and the persons who act on behalf of the President shall be impartial in the performance of duties. When the President and Vice-Presidents of the House of Representatives or the President and the Vice-Presidents of the Senate are not present at any sitting, the members of each House shall elect one among themselves to preside over such sitting. Section 120. At a sitting of the House of Representatives or the Senate, the presence of not less than one-half of the total number of existing members of each House is required to constitute a quorum, except in cases of considering the agenda on interpellation, where the House of Representatives or the Senate may otherwise prescribe a quorum in the rules of procedure. A resolution on any consultation issue shall be made by a majority of votes, unless it is otherwise provided in the Constitution. In casting a vote, each member has one vote. In case of an equality of votes, the presiding member shall have an additional vote as a casting vote. The minutes of sittings and records of each member’s voting shall be disclosed to the general public, except for the case of a sitting in camera or voting by secret ballot. The casting of votes to elect or give approval to a person for holding any office shall be made by secret ballot, unless it is otherwise provided in the Constitution. Section 121. Within fifteen days as from the announcement date of the result of the election of Members of the House of Representatives which is a general election, the National Assembly shall be convoked for the first sitting of its members.