according to one of the fundamental rules of th constitution who holds the ultimate authority in the united states

The people

The United States constitution identifies all power as belonging to the people. It states that "We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution"