Khan took the oath of office on Saturday, a day after being elected by a majority of lawmakers in the National Assembly. His Tehreek-e-Insaf party won the most seats in the July 25 national elections but fell short of an outright majority. It allied with independents to form a coalition.
Khan had campaigned on promises to combat Pakistan’s endemic corruption and break powerful landowners’ monopoly on political power.
Opposition parties have held regular protests since last month’s election, alleging vote rigging by the powerful security establishment. Security officials have rejected the allegations.