mulia Yock Teo Lim Seng Parliament GRC Choon minister Member Swee Jayakumar Cheow Datuk Chua Kah Hng Chee Tarmugi MP Rajaratnam Mustapa Tan Minister Hishammuddin Siew Lee Malaysia Toh Ong Itimi Keong Kiang Yaacob resigned Siong Tun principal Khaw