The Pakistan Tehreek-i-Insaf (PTI) on Wednesday approached the Lahore High Court to challenge the appointment of bureaucrats by the caretaker provincial government in Punjab, to act as returning officers (ROs) for the upcoming general elections. Barrister Umair Khan Niazi, additional secretary general of the PTI, filed a writ petition, asking the court to strike down sections 50(1)(b) and 51(1) of …