Justifying the overnight move to send the CBI's top two officers on leave, the government today called it a move to ensure fairness and the "institutional integrity" of the country's top investigating agency. Union Minister Arun Jaitley, articulating the government's first response to a barrage of questions and allegations after the CBI move, said:"...to maintain the fairness of an impartial probe, as well as to maintain the highest standard of integrity of the country's premier investigating agency, it was necessary that the two seniormost officers involved must sit out on leave till an impartial investigation is complete."