NAB summoned them over their involvement in corruption. Chairman NAB directed regular investigation into relevant complaints. PESHAWAR: National Accountability Bureau(NAB) Khyber Pakhtunkhwa summoned former Speaker of National Assembly Asad Qaiser along with former provincial ministers Shahram Khan Tarakai and Atif Khan. According to the statement issued by NAB, NAB Khyber Pakhtunkhwa has summoned former Speaker of National Assembly Asad Qaiser