Yes.
Why is he not subject to arrest for TREASON?
Federal. Definition: In Article III, Section 3 of the United States Constitution, treason is specifically limited to levying war against the US, or adhering to their enemies, giving them aid and comfort.
Spying, illegal or not, doesn't get there.
Thanks for the response. Just dang. How bout sedition or something under the espionage act other than spying. How bout being a dirty low down scoundrel? It worked in 1940s western movies? LOL!