The PTI also demanded deployment of army personnel inside and outside polling stations during the by-polls, which are scheduled to be held on April 23.
Addressing a press conference, PTI senior leader Arif Alvi said Ismail is one of the founders of PTI.
He hoped that PTI will emerge victorious in the NA-246 by elections.
Speaking on the occasion, Ismail said MQM exploited rights of Muhajirs and befooled them on pretext of allocating
Talking to ARY News, MQM leader Waseem Akhtar said nation will witness the results in the by-elections. He said Altaf Hussain had earned Muhajirs an identity in the country.
He asked where were the PTI leaders when Muhajirs were under attack and their slaughtering was rampant in the city.
He said PTI is the Taliban wing which intends to capture Karachi.
Akhtar claimed that daughter of slain PTI leader Zahra Shahid points at PTI for murder of her mother.
The NA-246 seat had fallen vacant after resignation of Nabeel Gabol, who also parted ways with the MQM later. Mr Gabol was elected to the assembly from the Azizabad constituency on a ticket of the Muttahida Qaumi Movement in the May 2013 general elections.