"I invite Farooq Sattar and the whole leadership of the MQM-P to join hands with us so we can serve the public together," he told reporters at a press conference at the PSP headquarters, Pakistan House.
"The Pakistan People's Party (PPP) is benefiting from the current political situation of the city despite the stories of its corruption and incompetence," he added.
Afaq comes out in support of MQM-Pakistan in PS-114
Kamal's invitation has come a day after the MQM-P's Kamran Tessori lost the Sunday's by-election in PS-114 to PPP's Saeed Ghani, by a margin of over 5,000 votes.
Tessori was backed by the Mohajir Qaumi Movement-Haqiqi but opposed by the pro-Altaf Hussain MQM-London.
Kamal asked MQM-P leaders to not let their ego or political stature stop them from making the "right decision of joining hands".
"Let's work for the people [irrespective of their ethnicity] living in this city by chalking out a common strategy," he said.
The PSP chief added that Sattar's narrative - that the citizens were obsessed with the MQM or its electoral symbol kite and ethnicity-based politics would work - had failed.
Reinventing itself: MQM-London to start campaign to reclaim party
"I want everyone present to bear witness that I'm extending the hand of friendship to the MQM-P."
PM should resign
Kamal demanded that Prime Minister Nawaz Sharif should resign now that the report presented the top court's Joint Investigation Team had found him and family guilty of wrongdoing.
"If Nawaz Sharif defends himself while holding the office [of the prime minister], it will ultimately affect the country and democracy," he added.
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