Article III, Section 3:
“Treason against the United States, shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort. No Person shall be convicted of Treason unless on the Testimony of two Witnesses to the same overt Act, or on Confession in open Court."
If Enemies is a subset of Everyone, then giving Aid and Comfort to Everyone is an act of Treason, at least until the US makes peace with Everyone. Specifically what Snowdon exposed was the difficulty the US Government has in distinguishing between Everyone and Enemy.
"Eddard Stark: What you suggest is treason.
Petyr 'Littlefinger' Baelish: Only if we lose."