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The political party or coalition of parties that make up a majority of the parliament’s membership select the prime minister and department ministers. The prime minister usually is the leader of the majority party, if there is one, or the leader of one of the parties in the ruling coalition. Some ceremonial executive duties are carried out by a symbolic head of state — a hereditary king or queen in a democratic constitutional monarchy, such as Great Britain, Japan, Norway, or Spain, or an elected president or chancellor in a democratic constitutional republic such as Germany, Italy, or Latvia. The judicial function typically is independent of the legislative and executive components of the system.
In a parliamentary system, laws are made by majority vote of the legislature and signed by the head of state, who does not have an effective veto power. In most parliamentary democracies, the head of state can return a bill to the legislative body to signify disagreement with it. But the parliament can override this ‘‘veto’’ with a simple majority vote.
In most parliamentary systems, there is a special constitutional court that can declare a law unconstitutional if it violates provisions of the supreme law of the land, the constitution. In a few parliamentary systems, such as Great Britain, New Zealand, and the Netherlands, there is no provision for constitutional or judicial review, and the people collectively possess the only check on the otherwise supreme legislature, which is to vote members of the majority party or parties out of office at the next election.
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