Standing Rules of the United States Senate, Rule III
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Article Six of the United States Constitution provides that Senators, as well as all other federal office-holders, "shall be bound by Oath or Affirmation, to support this Constitution." Section 3331 of Title 5 of the United States Code establishes the oath of office.
"I, (name of Senator), do solemnly swear (or affirm) that I will support and defend the Constitution of the United States against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; that I take this obligation freely, without any mental reservation or purpose of evasion; and that I will well and faithfully discharge the duties of the office on which I am about to enter: So help me God."