President can withhold his assent to a bill passed by both the houses of the Parliament under article:

Article 111 of the Constitution deals with President's assent to Bills. When a Bill is passed by both Houses, the President may give assent, withhold assent (pocket veto), or return the Bill (except Money Bills) for reconsideration. Withholding assent is a constitutional option available to the President, though it's rarely exercised.