Before he enter on the Execution of his Office, he shall take the following Oath or Affirmation:—“I do solemnly swear (or affirm) that I will faithfully execute the Office of President of the United States, and will to the best of my Ability, preserve, protect and defend the Constitution of the United States.”
Clause 8
U.S. Const. art. II, § 1, cl. 8, under Section 1.
U.S. Const. art. II, § 1, cl. 8
Clause 8