National Security Council 11 (3) The quorum of the Council shall be five. Temporary exercise of functions of Chairman 9. (1) The Deputy Chairman shall act as the Chairman for the period when— (a) the office of the Chairman is vacant; (b) the Chairman is absent from duty or from Malaysia; or (c) the Chairman is, for any other reason, unable to carry out his functions. (2) The Deputy Chairman shall, during the period in which he is carrying out the functions of the Chairman under this section, be deemed to be the Chairman. Council may invite others to meetings 10. The Council may invite any person not being a member of the Council to attend its meetings to advise the Council on any matter under discussion. Procedures 11. Subject to this Act, the Council may determine its own procedure. Council may establish committees 12. (1) The Council may establish any committee as it considers necessary or expedient to assist it in the performance of its functions. (2) The Council may appoint any person to be a member of any committee established under subsection (1).