The UK Prime Minister is the head of the UK government and is responsible for overseeing the operation of the government and the execution of its policies. The Prime Minister is usually the leader of the political party that has the most seats in the House of Commons, the lower house of Parliament. They are appointed by the Monarch and can be removed by a vote of no confidence. Prime Ministers have significant influence over national and international affairs, including economic policy, defense, and foreign relations. They work closely with their Cabinet, which consists of senior government ministers, to make decisions and implement laws. Notable Prime Ministers include Winston Churchill, Margaret Thatcher, and Tony Blair.