Rights & liberties
oath of office
The promise to support and defend the Constitution, required of every federal and state officeholder by Article VI. The President's wording is set by Article II.
In full
Article VI binds legislators, executive officers, and judges at both levels to support the Constitution, and forbids any religious test. The oath may be affirmed rather than sworn. It is an obligation to the document rather than to a person or party, which is the point most often invoked when officials describe conflicting duties.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.