Tarar assumed office in January 1998 with heavy criticism by opposition especially from former Prime Minister Benazir Bhutto who accused him of illegally legitimizing dismissal of his government as a judge of Supreme Court of Pakistan. As a head of state, Tarar shifted Pakistan's system of government from semi-presidential system to parliamentary democratic system by signing Thirteenth Constitutional Amendment. He surrendered his reserve power of dismissing Prime Minister, triggering new elections and dissolving National Assembly. He also signed the Fourteenth and Fifteenth amendment to the constitution that limited the powers of the presidency from executive to a figurehead.