(a) (b) (c) (d) act for the President in his or her absence from the country; be a member of the Council of Ministers; be a member of the Security Council; and perform any other function or duty that may be assigned to him or her by the President. Vacancy of Office of the Vice President 107. The office of the Vice President shall fall vacant in any of the following cases: (a) (b) (c) (d) relief from office in accordance with the provisions of Article 105 (2) herein; acceptance of his or her written resignation by the President; mental infirmity or physical incapacity based on an official medical report submitted by the Medical Commission to the Assembly for information; or death. Presidential Advisors 108. (1) The President may appoint a limited number of Presidential Advisors and shall define their functions. (2) To assume office, a Presidential Advisor shall, before the President, take the following oath: “I……….…………., do hereby swear by the Almighty God/solemnly affirm/, that as a Presidential Advisor, I shall be faithful and bear true faith and allegiance to South Sudan and shall diligently and honestly discharge my duties and responsibilities and strive to foster the development and welfare of its people; that I shall obey, preserve and defend the Constitution and abide by the law; and that I shall protect and promote the unity of the people of South Sudan and consolidate the democratic decentralized system of government and preserve the integrity and dignity of the people of South Sudan; so help me God.” CHAPTER III THE NATIONAL COUNCIL OF MINISTERS Establishment and Composition of the Council of Ministers 109. (1) There shall be established a National Council of Ministers. (2) The National Council of Ministers shall compose of the President, the Vice President and Ministers. (3) The President shall ensure that at least twenty-five percent of members of the Council of Ministers are women. 36