So below is the oath of the President of the United States. He just agreed to "preserve the constitution" . If that is so we have nothing to worry about. Now if he lied...............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."