The hereditary Sultan of Terengganu since 1998 has been Sultan Mizan Zainal Abidin, who was elected as the current 13th Yang di-Pertuan Agong or King of Malaysia. As per the Malaysian constitution, the King cannot reigns both as the Head of State of the federation and as ruling monarch of his state. The Regent (Pemangku Raja) of Terengganu is now the King's eldest son, Tengku Muhammad Ismail. As he is not yet of age suitable for the post (only being eight-years old), the Prince co-reigns with the three-member Regency Advisory Council (Majlis Penasihat Pemangku Raja) headed by Raja Tengku Baderulzaman (the King's younger brother) as dictated by syarat (2) Fasal 16 AA Undang-Undang Bagi Diri Kerajaan Terengganu (Bab Yang Kedua) under the state constitution. The Menteri Besar is currently Dato' Idris Jusoh of Barisan Nasional, a businessman.