39 Section 113. A Senator shall not align with or yield to the mandate of any political party. Part 4 Provisions Applicable to Both Houses Section 114. Members of the House of Representatives and Senators are representatives of the Thai people and free from any mandate, commitment, or control. They shall perform duties honestly for the common interest of the Nation and the happiness of Thai people as a whole, without conflict of interest. Section 115. Before taking office, a Member of the House of Representatives and a Senator shall make a solemn declaration at a sitting of the House of which he or she is a member in the following words: “I, (name of the declarer), do solemnly declare that I will perform my duties in accordance with the honest dictates of my conscience for the common interest of the country and the people. I will also uphold and observe the Constitution of the Kingdom of Thailand in every respect.” Section 116. The House of Representatives and the Senate shall each have one President and one or two Vice-Presidents who are appointed by the King from members of such House in accordance with its resolution. While in office, the President and the Vice-Presidents of the House of Representatives shall not concurrently be members of the executive committee of a political party or hold any position in a political party. Section 117. The President and the Vice-Presidents of the House of Representatives hold office until the expiration of their term or the dissolution of the House of Representatives. The President and the Vice-Presidents of the Senate hold office until the date of expiration of the term of the Senate, except for the period under section 109 paragraph three where the President and the Vice-Presidents of the Senate shall remain in office to perform duties. Section 118. The President and the Vice-Presidents of the House of Representatives and the President and the Vice-Presidents of the Senate vacate office before the expiration of the term of office under section 117 upon: