The Government of Israel (officially: Memshelet Yisrael) exercises executive authority in the State of Israel. It consists of ministers who are chosen and led by the prime minister. In choosing ministers, the prime minister must appoint members based on the distribution of votes to political parties during parliamentary elections, and the composition of the government must be approved by a vote of the Knesset (the Israeli parliament). Under Israeli law, the prime minister may dismiss members of the government, but must do so in writing, and new appointees must be approved by the Knesset. Most ministers lead ministries, though some are ministers without portfolio. Most ministers are members of the Knesset, though only the Prime Minister and the "designated acting prime minister" are actually required to be Knesset members. Some ministers are also called deputy and vice prime ministers. Unlike the designated acting prime minister, these roles have no statutory meanings. The government operates in accordance with the Basic Law. It meets on Sundays weekly in Jerusalem. There may be additional meetings if circumstances require it. The prime minister convenes these meetings.