National politics in Cambodia take place within the framework of the nation's constitution of 1993. The government is a constitutional monarchy operated as a parliamentary representative democracy. The Prime Minister of Cambodia, an office held by Hun Sen since 1985, is the head of government, while the King of Cambodia (currently Norodom Sihamoni) is the head of state. The prime minister is appointed by the king, on the advice and with the approval of the National Assembly. The prime minister and the ministerial appointees exercise executive power.