The method of electing heads of government is the main difference between the parliamentary government and the presidential system. The head of the parliamentary government is elected by the legislature and usually has the title of prime minister. This is the case in the UK and Canada. In the UK, voters elect a member of the British House of Commons every five years; a party that receives a majority of seats then chooses the executive cabinet and members of the prime minister. As long as the legislature has confidence in them, the Prime Minister and his cabinet will serve. In Canada, the leader of a political party that won a majority in the parliament became the prime minister. In contrast, in the presidential system practiced in the United States, voters elect members of parliament to serve in the legislative branch of the government and elect the head of government, the president. The term of office of the president and members of parliament is fixed and does not depend on the confidence of the voters. The president can only serve two terms, but members of Congress do not have a term limit. In fact, there is no mechanism to remove parliamentarians. Although the US Constitution has exempted the current president from the regulations – the bomb and the twenty-fifth amendment, there has never been a commander-in-chief forced to remove from the whites. house.