Aamir Liaquat had joined the PTI in March 2018 and was elected as MNA from Karachi in the general elections held later that year. He had later fallen out with the party. He had earlier been a key leader of the Muttahida Qaumi Movement (MQM) and had parted ways with the party in August 2016, saying at the time that he would be leaving politics.
https://www.24newshd.tv/09-Jun-2022/dr-aamir-liaquat-hussain-passes-away-in-karachi

