It was clearly mentioned in constitution that Parliamentary Party head is party head but supreme court in its various decisions stated that in-fact Party Head, whether elected or nor is real head of party.
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PTI stance in Nawaz Sharif as Party Head Case, which was accepted by SC.
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Even today Ch. Shujaat removed Q-league's Parliamentary Party Leader. Who to vote in Punjab Assembly by PTI would be a decision of Imran Khan not Sabtain Khan the Parliamentary Party Leader of PTI.