Constitution of the Republic of Singapore · 2020 Revised Edition · Part 5 · The Government
17A. Election of President
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The President is to be elected by the citizens of Singapore in accordance with any law made by the Legislature.
President
“President” means the President of Singapore elected under this Constitution and includes any person for the time being exercising the functions of the office of President;
Any poll for the election of President must be held as follows:
in the case where the office of President becomes vacant prior to the expiration of the term of office of the incumbent and a writ for the election has not been issued before such vacation of office or, if so issued, has already been countermanded — within 6 months after the date the office of President becomes vacant; or
in any other case — not more than 3 months before the date of expiration of the term of office of the incumbent.