Oath of Office -
"...support and defend the Constitution..."
U.S. Federal and Military Oath of Office
" I, AB, 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.''
Oath of Office - "...support and defend the Constitution..."