Lawmakers from the four provincial assemblies and the federal parliament voted in secret on the new senators, who are due to serve six-year terms.
The win also gives incoming prime minister and former leader of the PML-N Nawaz Sharif a possible new avenue to re-enter politics, following his disqualification from office on charges of corruption past year. "The people will support us more as more decisions will come against us", the PML-N leader said. Shahbaz has done heavy groundwork there, riding on his past as the province's governor.
After the Saturday's polls to elect 52 senators in place of those retiring on March 11, PML-N emerged as the leading party having 33 members in the upper house, 20 short of required number needed for the top slot of chairman.
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'PML-N now the single largest party in Senate as well, Masha'Allah, tweeted Sharif's daughter and presumed heir, Maryam Nawaz Sharif.More news: Australia extends lead to 301 over South Africa in 1st test
Sharif has alleged he is the victim of a conspiracy by Pakistan's deep state to damage civilian power.
These candidates ran as "independents" with the official results of the vote not showing their links to the PML-N, but does give the party effective control over the upper house.
Furthermore, the former secretary general of Pakistan Tehreek-e-Insaf (PTI) and senior leader, Jahangir Khan Tareen is also said to have contacted senator-elect Anwar-ul-Haq Kakar and congratulated him on his success in the elections.
Under Pakistan's constitution a bill can not become law unless it is passed by both upper and lower houses of parliament.