Tehreek-i-Insaf chief Khan promised his supporters that he would stay in front of the Parliament till Sharif quits.
"There are thousands of people here who are not ready to go away without your (Sharif) resignation," he said today.
Khan's supporters from Islamabad and Rawalpindi go to their homes in the night and spend the day in their daily activities, but turned up for the protest in the evening.
Populist cleric Tahir-ul Qadri of Pakistan Awaami Tehreek is also camping close to Khan's camp. His supporters have vacated the parking lot of the Parliament and are now sitting near the Constitution Avenue.
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Khan wants the ruling PML-N government's ouster over alleged rigging in last year's polls which his party lost, while Qadri wants to bring a revolution in the country.
Both the leaders are agitating since August 14.
Khan's supporters have refused to vacate the Avenue despite the Supreme Court asking them to open one side of the road for traffic.
Pakistan government had proposed a judicial commission to probe the alleged rigging while Sharif has shown willingness to resign if the charges against him are proved.