The Prime Minister of the Socialist Republic of Vietnam , known as Chairman of the Council of Ministers (Vietnamese: Chủ tịch Hội đồng Bộ trưởng) from 1981 to 1992, is the highest office within the Central Government. The prime minister is simultaneously the Secretary of the Government Caucus Commission, a Party organ on government affairs, and Deputy Chairman of the Council for Defence and Security, a organ of the National Assembly. Throughout its history, the office has been responsible, at least in theory but not always in practice, for handling Vietnam's internal policies. Since Vietnam is a one-party state, with the Communist Party of Vietnam being the sole party allowed by the constitution, all the prime ministers of the Democratic Republic and the Socialist Republic have been members of the party while holding office. The current prime minister is Nguyễn Tấn Dũng, since 27 June 2006. He is third-ranked in the Political Bureau (Politburo).