It is being said by analysts that the PDM's defeat in the Senate chairman election has been a major setback for the joint opposition, which has given the government some relief amid its falling popularity.
The trio spoke about the possibility of reaching out to the relevant institutions to challenge the election results.
Former president Asif Ali Zardari assured the other two leaders of action against PPP senators in case they were found guilty of deliberately having their votes rejected.
8 votes polled in the Senate chairman election were rejected, 7 of which were cast in favour of PDM's candidate Yousaf Raza Gilani.
Nawaz Sharif was of the opinion that the establishment was responsible for the opposition's defeat, Express Tribune reported. The PML-N leader also proposed checking telephonic data of Senators who received anonymous calls and those who had held meetings with government officials or candidates.
It was also reportedly agreed during the conversation that investigation will be held against the opposition senators who have close links with the newly-elected Chairman Sadiq Sanjrani.