LAHORE: Five senior PTI leaders, incarcerated in Kot Lakhpat Jail, have urged opposition leaders to “engage constructively” with Prime Minister Shahbaz Sharif on a “Charter of Pakistan” — a move they deem will address the root cause of instability in the country. They made the appeal in a joint letter to National Assembly Opposition Leader Mehmood Khan Achakzai, Senate Opposition Leader Allama Raja Nasir Abbas and PTI Chairman Barrister Gohar Ali Khan. The letter by Shah Mehmood Qureshi, Dr Yasmin Rashid, Omar Sarfraz Cheema, Ejaz Chaudhry and Mian Mahmoodur Rasheed was shared by their counsel Rana Mudassar Umer and dated June 17.