Move Forward must officially renounce opposition leader role, says WanPadipat Suntiphada, right, and Move Forward Party leader Pita Limjaroenrat meet reporters at the parliament after the former was elected a deputy House speaker on July 4. Mr Wan said the right to assume the opposition leader seat must go to the leader of the biggest part of the opposition. A party cannot have its MP concurrently occupy the positions of deputy House speaker and opposition leader. "The charter and the parliamentary rules dictate that an opposition leader must be appointed," he said, explaining that the leader of the opposition takes part in selecting members of some independent agencies. But Mr Wan insisted no deadline is imposed on when the opposition leader must take office.