PML-N chief and former Pakistanipremier Nawaz Sharif on Tuesday filed nomination papers for parliamentary bye-elections to be held next month from two constituencies in Rawalpindi and Lahore. Sharif’s papers were filed for a National Assembly seat in Rawalpindi that was won by senior PML-N leader Chaudhry Nisar Ali Khan in the February 18 general election. Khan gave up the seat as he had won from more than one constituency.