Kedah Umno members have lodged a police report against former Kedah menteri besar Mukhriz Mahathir for his remarks claiming that former premier Najib Abdul Razak is the "protagonist" behind his political downfall.

The group, led by Ahmad Sudin, a former Kedah state executive councillor cited Mukhriz's remark when he quit the state's top post yesterday at Wisma Darul Aman.