 However, three weeks later General Ayub—who had been openly questioning the authority of the government before the imposition of martial law—deposed Iskandar Mirza on 27 October 1958 and assumed the presidency that practically formalized the militarization of the political system in Pakistan.Four years later a new document, Constitution of 1962, was adopted.The second martial law was imposed on 25 March 1969, when President Ayub Khan abrogated the Constitution of 1962 and handed over power to the Army Commander-in-Chief, General Agha Mohammad Yahya Khan.