Im assuming that you are asking about the Constitution. Article 2 section 4 of the Constitution literally says, “The President, Vice President and all civil officers of the United States, shall be removed from office on impeachment for, and conviction of, treason, bribery, or other high crimes and misdemeanors.”
The correct answer is "the head of the party"
The President is seen as the head of the party to which they belong.
The Anti-Federalists’ main objection to ratifying the Constitution was that it would place too much power in the hands of the federal government over the individual states. This is why they insisted on a "Bill of Rights" to be added to the Constitution to protect individual liberty.
