Changing the constitution demands a two-thirds majority vote in the Parliament. However, to change the scope and sovereignty of the country, such as becoming a part of Malaysia again, a referendum showing the support of two-thirds of all voters is required. The constitution is changed from time to time, including to create MPs who are not elected in constituencies, i.e. by the voters, but to introduce representation for others who do not get the support of voters. These are called NMPs and NCMPs. In changing the constitution and some other matters, they are not allowed to vote. 