The Constitution – Article II, section 2, clause 1

Commander in Chief

“The President shall be Commander in Chief of the Army and Navy of the United States…”

Commander of Militia

“…and of the Militia of the several States, when called into the actual Service of the United States…”

Opinion Clause

“…he may require the Opinion, in writing, of the principal Officer in each of the executive Departments, upon any Subject relating to the Duties of their respective Offices…”

Pardon Power Clause

“…and he shall have Power to grant Reprieves and Pardons for Offences against the United States, except in Cases of Impeachment.”