Glenn Greenwald set forth 5 principles in this article on The Intercept. The article includes a video discussion with Chris Hayes. One of the principles is this:

Last night, I was on Chris Hayes’s show (video below) discussing the Podesta email leak and made this point, and some people reacted as though this were some bizarre, exotic claim — rather than what it is: the fundamental principle of journalism as well the basis of numerous laws. Of course it’s the case that the more power someone has, the less privacy they have, and every media outlet, literally every day, operates on that principle, as do multiple sectors of law.

That there are different standards of privacy for different people based on their power and position is axiomatic. That’s why laws like FOIA requiring disclosure (including of emails) apply only to public officials but not to private citizens: It embraces the proposition that those who wield public power submit to greater transparency than private citizens do. This same principle is why people cheered when the NYT published Trump’s tax return even though they’d be horrified if the NYT published the tax return of ordinary citizens — because people like Trump who wield or seek great political power sacrifice some degree of privacy.

Here are the five principles Greenwald sets forth:
1. A source’s motives are irrelevant in deciding whether to publish
2. Journalists constantly publish material that is stolen or illegally obtained.
3. The more public power someone has, the less privacy they are entitled to claim
4. Whether something is “shocking” or “earth-shattering” is an irrelevant standard
5. All journalists are arbiters of privacy and gatekeepers of information