Imran Khan, chairman of Pakistan Tehreek-e-Insaf (PTI) party, speaks during an event in Islamabad, capital of Pakistan, on Aug. 6, 2018. Pakistan Tehreek-e-Insaf (PTI), or the Movement for Justice party, on Monday formally nominated its chief Imran Khan as the candidate for the office of the prime minister, party officials said. (Xinhua/PTI)