Senator Dr Shehzad Waseem has become leader of the opposition and his notification has also been issued by the Senate chairman.
The Senate chairman has issued an official notification of Senator Waseem.
Earlier, former premier Gillani contested for the slot of Senate chairman against Sadiq Sanjrani, who currently serves this post, but his seven votes had been discarded by the then chairman, an appointee of President Arif Alvi.
Senate is in its 20th parliamentary year and its 318th session is taking place in a tense political situation, and it is likely that Prime Minister Shehbaz Sharif, who is the leader of the House in both houses of Parliament, would make his maiden appearance during its upcoming session.
According to reliable sources, PM Shehbaz Sharif will make an important policy statement on the political and economic situation in the country at today's sitting of the Upper House.