Imran Khan, chairman of the Pakistan Tehreek-e-Insaf (PTI), political party, gestures as he speaks during an interview with Reuters on a plane after a campaign rally ahead of general elections in Narowal, Pakistan July 13, 2018. REUTERS/Stringer

Imran Khan (C), chairman of the Pakistan Tehreek-e-Insaf (PTI), holds his palms to pray and expresses condolence to the relatives of deceased Siraj Raisani, provincial assembly candidate of Baluchistan Awami Party (BAP), who was killed in Friday?s suicide attack during an election campaign meeting, in Quetta, Pakistan July 15, 2018.

Tehrik-e-Insaf party chief and former cricket captain Imran Khan receives medical check-up during a blood donation August 23 inside a blood donors camp in Karachi to help victims of terrorism. More than 255 people have been killed in Pakistan this year in different ethnic, sectarian and political violence.

Cricket star-turned-politician Imran Khan, chairman of Pakistan Tehreek-e-Insaf (PTI), speaks to members of media after casting his vote at a polling station during the general election in Islamabad, Pakistan, July 25, 2018.

Imran Khan, Pakistan's cricketer-turned politician and chief of Tehrik-e-Insaf party, addresses his supporters during his election rally in Karachi on August 11, 2002. Pakistan's military-led government of President Pervez Musharraf is seemed determined to hold general elections in the country scheduled to be held on October 10.

Imran Khan, Pakistani cricketer-turned-politician and chairman of the Pakistan Tehreek-e-Insaf (PTI) political party, speaks during an interview with Reuters at his office in Islamabad November 8, 2013.

Imran Khan, Pakistani cricketer turned politician, holds a copy of his autobiography after an interview at his residence in Islamabad November 16, 2011. Khan's confidence stems from what he sees is a tsunami of support for the Pakistan Tehreek-i-Insaf (Pakistan's Movement for Justice) in Pakistan as traditional parties falter amid charges and counter-charges of corruption and petty jealousies. On Oct 30, he staged a gigantic rally in Lahore that observers said pulled between 100,000 and 200,000 people, one of the largest political rallies ever in Pakistanb.

Supporters of Imran Khan, the Chairman of the Pakistan Tehreek-e-Insaf (PTI) political party, take a nap on Khan's campaign banner during what has been dubbed a "freedom march" in Islamabad August 25, 2014. Khan and cleric Tahir ul-Qadri, who controls a network of Islamic schools and hospitals, have been leading protests in the capital, Islamabad, trying to bring down Prime Minister Nawaz Sharif.

Imran Khan, cricketer turn politician and Chairman of Pakistan Tehreek-i-Insaaf speaks during an anti-Musharraf rally in Rawalpindi. Imran Khan, cricketer turn politician and Chairman of Pakistan Tehreek-i-Insaaf (PTI) speaks during an anti-Musharraf rally organised by Pakistan's opposition Islamic alliance Muttahida Majlis-e-Amal (MMA) in Rawalpindi December 19, 2004.

U.S. Secretary of State John Kerry (R) meets with Pakistan's opposition leader Imran Khan in Islamabad August 1, 2013. Kerry agreed with Pakistan on Thursday to re-establish a "full partnership" hurt by U.S. drone strikes and a 2011 NATO air attack in which 24 Pakistani soldiers were killed. Image used for illustrative purposes

Imran Khan, Pakistani cricketer turned politician, gestures after arriving to lead the Pakistan Tehreek-e- Insaf (PTI) rally in Lahore October 30, 2011. Khan, chairman of the PTI, on Sunday said the biggest problem facing Pakistan is corruption which the PTI will strive to eradicate and install honest officers in key positions, local media reported. REUTERS/Mohsin Raza Image used for illustrative purpose.

Imran Khan, chairman of the Pakistan Tehreek-e-Insaf (PTI), political party, holds his tasbih, or prayer beads, as he sits in a helicopter on his way to a campaign rally ahead of general elections in Narowal, Pakistan July 12, 2018.

Pakistan's former cricket hero-turned politician Imran Khan shows a victory sign during an election rally organised by his Tehreek-i-Insaaf (Justice Movement) party in a Lahore street late February 1. Imran Khan is campaigning to gain the prime ministership in Pakistan's general elections, set for February 3.

A supporter of Imran Khan, cricketer-turned-opposition-politician and chairman of the Pakistan Tehreek-e-Insaf (PTI) political party, wears a badge with a photo of him while attending the Freedom March in Islamabad August 16, 2014. More than 20,000 anti-government protesters flooded the centre of Pakistan's capital on Saturday, vowing to stay in the streets until Prime Minister Nawaz Sharif resigns.

Pakistani Prime Minister Imran Khan speaks during a news conference in Mumbai December 28, 2007.

Pakistani cricket hero and politician Imran Khan (C) leads a night time rally in central Karachi April 30. The rally was organised by Khan's Tehrik-e-Insaf party (Movement for Justice) to mark May Day which is being observed throughout Pakistan.

Imran Khan, cricketer-turned-politician and head of Pakistan Tehreek-e-Insaf (PTI), wears a traditional turban as his supporters shout slogans and throw rose petals as he leads a peace march against U.S. drone strikes from Islamabad to South Waziristan, in Musa Khel, located in the province of Punjab October 6, 2012. About 1000 PTI supporters including U.S. peace activists took part in a peace march which started on Saturday from Islamabad and due to reach South Waziristan on Sunday, according to local media. REUTERS/Saad Arsalan

Pakistani Prime Minister Imran Khan speaks with party leaders at his home in Bani Gala, outside Islamabad, Pakistan October 30, 2016.