...against all enemies foreign, and domestic!
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Article VI of the U.S. Constitution requires that Members of the U.S. Congress be bound by oath or affirmation to support the Constitution.
“I, (name of Member of Congress), 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” (5 U.S.C. §3331).