President Mamnoon Hussain administered the oath to legislators Daniyal Aziz, Mumtaz Ahmad Tarar, Syed Ayaz Ali Sherazi and Mir Dostain Khan Domki, who were unable to assume charge earlier.
Prime Minister (PM) Shahid Khaqan Abbasi was also present on the occasion.
A 43-member new cabinet was sworn in on August 4, including 27 federal and 16 state ministers. Khawaja Asif became Foreign Minister, Ahsan Iqbal was appointed as Interior Minister while Khurram Dastagir was given Defence Ministry.