Can the Vice-President act as President during casual vacancies?
Yes, the Vice-President can act as President during casual vacancies in the office of the President. According to section 65(1), "In the event of the occurrence of any vacancy in the office of the President by reason of his death, resignation or removal, or otherwise, the Vice-President shall act as President until the date on which a new President elected in accordance with the provisions of this Chapter to fill such vacancy enters upon his office."