The Israeli system of government is based on parliamentary democracy. The Prime Minister of Israel is the head of government and leader of a multi-party system. Executive power is exercised by the government (also known as the cabinet). Legislative power is vested in the Knesset. The Judiciary is independent of the executive and the legislature. The political system of the State of Israel and its main principles are set out in 11 Basic Laws. Israel does not have a written constitution. Presidency The President of the State is the de jure head of state of Israel. The position is largely an apolitical and ceremonial role, and is not considered a part of any Government Branch. The President's ceremonial roles include signing every law (except those pertaining to the President's powers) and international or bilateral treaty, ceremonially appointing the Prime Minister, confirming and endorsing the credentials of ambassadors, and receiving the credentials of foreign diplomats. The President also has several important functions in government. The President is the only government official with the power to pardon or commute prisoners. The President appoints the governor of the Bank of Israel, the president of the national emergency relief service Magen David Adom, and the members and leaders of several institutions. The President also ceremonially appoints judges to their posts after their selection. Executive branch The Prime Minister is the most powerful political figure in the country. The Prime Minister is ceremonially appointed by the President upon recommendation of party Representatives in the Knesset, and makes foreign and domestic policy decisions which are voted on by the cabinet. The cabinet is composed of ministers, most of whom are the heads of government departments, though some are deputy ministers and ministers without portfolio. Cabinet ministers are appointed by the Prime Minister. The cabinet's composition must also be approved by the Knesset. The Prime Minister may dismiss cabinet members, but any replacements must be approved by the Knesset. Most ministers are members of the Knesset, though only the Prime Minister is required to be one. The cabinet meets weekly on Sundays, and there may be additional meetings if circumstances require it. Each cabinet meeting is chaired by the Prime Minister. A select group of ministers led by the Prime Minister forms the security cabinet, responsible for outlining and implementing a foreign and defense policy. This forum is designed to coordinate diplomatic negotiations, and to make quick