According to sources, Niazi stepped down from the position over differences with party leaders on the party policies.
The party spokesman Naeem-ul-Haq confirmed that Niazi had submitted his resignation as the party leader.
He was appointed as the deputy central organizer of the party in 2015.
It should be noted that he was the chief of party’s committee during PTI’s sit-in in Islamabad two years ago.
Niazi, said to be a close accomplice of PTI Chairman Imran Khan, has resigned when PTI is set to launch its anti-government march towards Raiwind.