Rais said their presence was not only important during the debate session, but also during other sessions to enable issues regarding people's interest to be discussed and defended.
“It has been brought to my knowledge that some of the Yang Berhormat went missing after marking their attendance.
"We have vowed to defend the constitution, so our presence in this hall should reflect that," he said after the swearing-in of PAS Youth chief Khairil Nizam Khirudin as senator.
Khairil Nizam, 41, was appointed for the first time by Yang di-Pertuan Agong.
Rais said he hoped Khairil Nizam would use his expertise and experience as a professional to add value to the Senate.
-- BERNAMA