(a) act in the absence of the President of the Republic in accordance with the provisions of this Constitution, (b) membership of the National Council of Ministers, (c) membership of the National Security Council, (d) membership of the Presidential Council in the pre­ election period, (e) chairmanship of the Presidential Council in the post election period in the event of the office of the President falling vacant, (f) any other function or duty that may be assigned to him/her by the President of the Republic. (2) The Vice President shall have the following functions:(a) act in the absence of the President of the Republic and the First Vice President in accordance with the provisions of this Constitution, (b) membership of the National Council of Ministers, (c) membership of the Presidential Council and Commander-in-Chief of Sudan Armed Forces should the office of the President of the Republic fall vacant according to Articles 65 and 66 herein, (d) membership of the National Security Council, (e) any other function or duty that may be assigned to him/her by the President taking into account the hierarchy within the Presidency. Vacancy of the Office of the First Vice President 64. Should the office of the First Vice President fall vacant, the President of the Republic shall appoint a new First Vice President in accordance with this Constitution. CHAPTER III INTERIM PROVISIONS FOR THE PRESIDENCY OF THE REPUBLIC The Incumbent President and the First Vice President 65. Prior to the elections that shall be held during the interim period:- 24