Senate Chairman Yousuf Raza Gilani on Tuesday notified Majlis Wahdat-e-Muslimeen (MWM) chief and PTI-backed Senator Allama Raja Nasir Abbas as the opposition leader in the upper house of parliament.

The development came a week after Tehreek Tahafuz Ayeen-e-Pakistan (TTAP) chief Mehmood Khan Achakzai was appointed leader of the opposition in the National Assembly.