On 7 August, the day after the atomic bombing of Hiroshima, the Preparatory Committee for Indonesian Independence () or PPKI was established. Sukarno was chairman, and Hatta vice-chairman. The two proclaimed the Independence of Indonesia on 17 August. On 18 August, the PPKI accepted the constitution drawn up by the BPUPK as the provisional Constitution of Indonesia and decided that during a six-month transition period, the new republic would be governed according to the constitution by a president, assisted by a National Committee, who would establish the two chamber legislature mandated by the constitution. The upper chamber, the People's Consultative Assembly would then have six months to draw up a new constitution, leaving open the possibility that this would be an entirely new document free of the influence of the situation prevailing during World War II. The PPKI also named Sukarno as president and Hatta vice-president.