William J. Brennan,
Nixon v. Administrator of General Services…
“ In pursuit of that principle, executive power was vested in the President; no other offices in the Executive Branch, other than the Presidency and Vice Presidency, were mandated by the Constitution. Only two Executive Branch offices, therefore, are creatures of the Constitution; all other departments and agencies, from the State Department to the General Services Administration, are creatures of the Congress and owe their very existence to the Legislative Branch. ”
