Ayub Khan succumbed to political pressure on 26 March 1969 and handed power to the Commander-in-Chief of the Pakistan Army, General Agha Muhammad Yahya Khan. President Yahya Khan imposed martial law and the 1962 Constitution was abrogated. On 31 March 1970, President Yahya Khan announced a Legal Framework Order (LFO) which called for direct elections for a unicameral legislature. Many in the West feared the East wing's demand for countrywide provincial autonomy. The purpose of the LFO was to secure the future Constitution which would be written after the election so that it would include safeguards such as preserving Pakistan's territorial integrity and Islamic ideology.