He or she is the leader of the party that holds the most seats in the House of Commons. The prime minister presides over the Cabinet and selects the other Cabinet members, who join him or her to form the government that is part of the functioning executive. The government is composed of ministers in the Cabinet, most of whom are members of the House of Commons; government departments, each of which is responsible to a minister; local authorities; and public corporations. Because the House of Commons is involved in both the legislative and executive branches of the British government, there is no separation of powers between executive and legislature as there is in the United States. The latter has the President as the chief executive compared to the UK's Prime Minister. When drafting the Constitution, the founders gave the president fewer specific powers than they extended to Congress because they were worried about placing too much power in the hands of one individual. However, the chief executive has many responsibilities. The president appoints personnel, including ambassadors, White House staff, and members of various boards and commissions, to more than 3,000 positions; oversees the many components of the executive branch of government; and proposes legislation to Congress, including the yearly federal budget. The president also directs foreign policy, commands the armed forces, negotiates and signs treaties, and serves as a symbol of the nation and a head of state with ceremonial duties. The increasing power of modern presidents does not violate the Constitution by intruding on the other branches of government. Rather, executive authority has expanded because of the loosely defined nature of the president's powers in the Constitution.
It is important to see how the election to the Presidency takes place as this gives a good impression on how to answer the question on the maintenance of democratic principles.