Imran Khan, Pakistani cricketer turned politician, gestures after arriving to lead the Pakistan Tehreek-e- Insaf (PTI) rally in Lahore October 30, 2011. Khan, chairman of the PTI, on Sunday said the biggest problem facing Pakistan is corruption which the PTI will strive to eradicate and install honest officers in key positions, local media reported. REUTERS/Mohsin Raza (PAKISTAN - Tags: POLITICS CIVIL UNREST)