The Deputy Prime Minister of the Socialist Republic of Vietnam , known as Deputy Chairman of the Council of Ministers from 1981 to 1992, is one of the highest offices within the Central Government. The deputy prime minister has throughout its history been responsible for helping the prime minister to handle 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 deputy prime ministers of the Democratic Republic and the Socialist Republic have been members of the party while holding office. There are currently five deputy prime ministers; Hoàng Trung Hải, Nguyễn Xuân Phúc, Phạm Bình Minh, Vũ Đức Đam, and Vũ Văn Ninh. Of these, only Nguyễn Xuân Phúc is a member of a Politburo, in which he is ranked 14th, making him the lowest-ranked member of the Politburo.