Constitution of the Independent State of Samoa 25 acting in his or her discretion, if in his or her opinion it is impracticable to obtain the advice of the Prime Minister by reason of the illness or absence of the Prime Minister and, in any other case, shall be exercised by the Head of State, acting on the advice of the Prime Minister. (6) The Head of State, acting on the advice of the Prime Minister, may by instrument under the Public Seal: (a) declare a Minister to be by reason of illness temporarily incapable of performing his or her functions as a Minister; or (b) suspend a Minister during the period of any investigation or inquiry into the conduct of that Minister. (7) Any Minister in respect of whom action has been taken under the provisions of clause (6) shall not perform any of the functions of his or her office or sit in or otherwise take part in the proceedings of Cabinet until the Head of State, acting on the advice of the Prime Minister, has revoked the aforesaid instrument under the Public Seal. 34. Official oath - Every Minister shall, before assuming the functions of his or her office, take and subscribe before the Head of State an oath in the form set out in the Third Schedule. 35. Assignment of responsibilities to Ministers - (1) The Prime Minister may, by direction in writing under his or her hand: (a) charge any Minister with the responsibility for any department or subject; and (b) revoke or vary any direction given under the provisions of this clause. (2) The Prime Minister may retain in his or her charge any department or subject. 36. Summoning of Cabinet - Cabinet shall be summoned only by the Prime Minister or, in his or her absence, by such Minister as the Prime Minister shall appoint in that behalf.