During the Parliamentary debates that led to the introduction of the NMP scheme, it was argued by a number of PAP MPs such as Dr. Arthur Beng, Dr. Tan Cheng Bock, Dr. Dixie Tan, and Dr. Aline Wong that the scheme is undemocratic in nature given the fact that NMPs are nominated rather than elected by the people for the people. However, in accordance with party discipline, they were eventually required to vote in favour of the constitutional amendment. As Beng said: "This is the constraint upon us, and I guess I will have to continue to live a schizophrenic political life – speaking against, yet voting for a Bill."