The politics of Antigua and Barbuda takes place in a framework of a unitary parliamentary representative democratic monarchy, wherein the Sovereign of Antigua and Barbuda is the head of state, appointing a Governor-General to act as vice-regal representative in the nation. A Prime Minister is appointed by the Governor-General as the head of government, and of a multi-party system; the Prime Minister advises the Governor-General on the appointment of a Council of Ministers. Executive power is exercised by the government. Legislative power is vested in both the government and the two chambers of the Parliament. The bicameral Parliament consists of the Senate (seventeen-member body appointed by the Governor General) and the House of Representatives (seventeen seats; members are elected by proportional representation to serve five-year terms).