@glitterbag,
You certainly are better informed, glitterbag.
What I found out on the web is that he signed a "CLASSIFIED INFORMATION NONDISCLOSURE AGREEMENT" (that seems similar to what I'd to sign, only ours was shorter).
In it, he (and others) "
swore" (= affirmed) "to support and defend the Constitution of the U.S., against all enemies, foreign and domestic".
He (and others) "
swore" to support and defend, among other elements of the Constitution, the First, Fourth, Fifth and Sixth Amendments in the Bill of Rights, and Article I, section 8, on war powers.