US Constitution, Article II, Section 1
Before he enter on the execution of his office, he shall take the
following oath or affirmation: "I do solemnly swear (or affirm) that I
will faithfully execute the office of President of the United States,
and will to the best of my ability, preserve, protect, and defend the
Constitution of the United States."
The reality of Barack Obama, who took that oath:
"Bugger the laws of this country."