The politics of Turkey take place in the framework of a constitutional republic and presidential system, with various levels and branches of power. Turkey's political system is based on a separation of powers. Executive power is exercised by the Council of Ministers, which is appointed and headed by the President, who serves as country's head of state and head of government. Legislative power is vested in the Grand National Assembly. The judiciary is independent of the executive and the legislature. Its current constitution was adopted on 7 November 1982 after a constitutional referendum. Major constitutional revisions were passed by the National Assembly on 21 January 2017 and approved by referendum on 16 April 2017. The reforms, among other measures, abolished the position of Prime Minister and designated the President as both head of state and government, effectively transforming Turkey from a parliamentary regime into a presidential one. Suffering is universal for citizens 18 years of age and older. National government Turkey is a presidential representative democracy and a constitutional republic within a pluriform multi-party system, in which the president (the head of state and head of government), parliament, and judiciary share powers reserved to the national government. The government is divided into three branches, as per the specific terms articulated in part three of the Turkish Constitution: Legislative: The unicameral Parliament makes law, debates and adopts the budget bills, declares war, approves treaties, proclaims amnesty and pardon, and has the power of impeachment, by which it can remove sitting members of the government. Executive: The president is the commander-in-chief of the military, can veto legislative bills before they become law (subject to parliamentary override), can issue presidential decrees on matters regarding executive power with exception of fundamental rights, individual rights and certain political rights (parliamentary laws prevail presidential decrees), and appoints the members of the Cabinet and other officers, who administer and enforce national laws and policies. Judicial: The Constitutional Court (for constitutional adjudication and review of individual applications concerning human rights), the Court of Cassation (final decision maker in ordinary judiciary), the Council of State (final decision maker in administrative judiciary) and the Court of Jurisdictional Disputes (for resolving the disputes between courts for constitutional jurisdiction) are the four organizations that are described by the Constitution as supreme courts. The judges of the Constitutional Court are appointed by the president and the parliament. Legislative power is invested in the