The politics of the Socialist Republic of Vietnam are defined by a single-party socialist republic framework, where the President of Vietnam is the head of state and the Prime Minister of Vietnam is the head of government, in a one-party system led by the Communist Party of Vietnam. Executive power is exercised by the government and the President of Vietnam. Legislative power is vested in the National Assembly of Vietnam . The Judiciary is independent of the executive. The parliament adopted the current Constitution of Vietnam; its fourth, on 15 April 1992, and it has been amended once since then.