Why are there still protests against him?
Despite winning the provincial assembly elections in Khyber Pukhtunkhwa, Imran Khan's Pakistan Tehreek e Insaf (PTI) complained of ballot rigging at national level and that the 35 seats it won did not reflect how people had voted.
His party increased the volume of its protest over the issue earlier this year and it coincided with growing concern in the Pakistan Army over Mr Sharif's conciliatory attempts to open dialogue with India and his "humiliation" of General Musharraf – the generals fear that a treason conviction of their former chief and dictator would be a humiliation for the entire military and want the charges to disappear.
The protests began with a march to Islamabad from the eastern city of Lahore on the country's Independence Day, August 14. A day later the demonstrators marched to the capital to try to oust Mr Sharif over alleged election fraud.