Persons to Exercise Functions of President
(1) If the office of President becomes vacant, the Chairman of the Council of Presidential Advisers or, if he is unavailable, the Speaker shall exercise the functions of the office of President during the period between the date the office of President becomes vacant and the assumption of office by the person declared elected as President.
(2) If neither the Chairman of the Council of Presidential Advisers nor the Speaker is available, Parliament may appoint a person in accordance with clause (3) to exercise the functions of the office of President during the period referred to in Clause (1).
(3) Parliament shall not appoint any person to exercise the functions of the office of President under clause (2) unless the person is qualified to be elected as President.
(4) The provisions of this Chapter relating to immunity from suits shall apply in relation to any person exercising the functions of the office of President pursuant to this article as if references to the President in those provisions were references to that person.
(5) Any person required or appointed to exercise the function of the office of President pursuant to this article or Article 22o shall, before exercising those functions, take and subscribe in the presence of the Chief Justice or another Judge of the Supreme Court the Oath of Office in the form set out in the First Schedule, except that neither the Chairman of the Council of Presidential Advisers nor the Speaker shall, during his term of office as such Chairman or as Speaker, be required to take such oath more than once in respect of occasions when he is required to exercise the functions of the office of President.