Surely being a famous or a notable political figure does not shatter all expectations of privacy.
If a rogue employee at a hospital emails your medical records to a newspaper can they publish it?
What about notes from a conversation with your lawyer?
[1]: https://www.nytimes.com/interactive/2020/09/27/us/donald-trump-taxes.html
What information is legal to handle is complicated, but my understanding is that in the US mostly the leaker is in trouble, whereas journalists can use obtained documents quite freely.