Petition: File charges against the 47 Senators in violation of the Logan Act
petitions.whitehouse.gov
petitions.whitehouse.gov
Overt acts (including unauthorized negotiations) which provide aid and comfort to enemies of the United States are treason.
The two categories are basically orthogonal; they aren't mutually exclusive.
In other words, it could meet the common-person interpretation of the word, but not the legal offense.