The The Pakistan Tehreek-e-Insaf (PTI) party, led by former Prime Minister Imran Khan, is gearing up for a major demonstration at Islamabads D-Chowk on Sunday, despite the federal governments strict security measures aimed at preventing the protest, reported The Express Tribune reported.(PTI) party, led by former Prime Minister Imran Khan, is gearing up for a major demonstration at Islamabads D-Chowk on Sunday, despite the federal governments strict security measures aimed at preventing the protest, reported The Express Tribune reported.