https://en.wikipedia.org/wiki/Shield_laws_in_the_United_Stat...
"There is no federal shield law and state shield laws vary in scope."
https://www.mtsu.edu/first-amendment/article/1241/shield-law...
"There is no federal shield law"
Not even former or sitting presidents are protected.
> possessed by a person reasonably believed to have a purpose to disseminate to the public a newspaper, book, broadcast, or other similar form of public communication, in or affecting interstate or foreign commerce;
"Journalist" is merely an informal summary of what the law actually states.