The end of Section1 in Article II.
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Presidential Oath of Office required to be sworn by every US President."I do solemnly swear (or affirm) that I will faithfully execute the office of presidential of the United States, and will to the best of my ability, preserve, protect, and defend the constitution of the United States"
He/She must preserve, protect and defend the Constitution of the United States
The Oath of Office is located in Article II of the U.S. Constitution. It is in the last paragraph of Section 1 of that article.
The US Constitution gives this choice of wording in the required oath of office.
It means that he has taken the "Oath of Office", binding him to the duties and standards of the presidency. The oath includes the phrase, "I do solemnly swear" -- "sworn is the past-tense of swear" so after he takes the oath, he has sworn to do his duty and so has been sworn in to office.