Yep, freedom of speech and freedom of press. You have no expectation of privacy in public, I have the right to take pictures of whatever I want in public (including of you).

I own the right to every photo I take, so I can publish whatever I want.

There are a few exceptions.

I use your likeness commercially without your permission, you can sue me for royalties and to force me to stop using your likeness, since you didn’t have a contract with me to be used to promote. The more famous you are, the more you can sue for, because your likeness is worth more.

If I use your name or likeness to spread rumors or misinformation about you, or to attempt to cast you in a bad light, you can sue me for libel or slander, since I did reputational damage to you, you can exact monetary damage from me. The more famous you are, the harder it is to sue without proving obvious malice, because being famous comes with the expectation of being talked about publicly in weird ways.

For example, if I accuse my next door neighbor of being a child rapist by plastering fake wanted posters around the neighborhood, he could sue the shit out of me for slander, and I would have to prove that I had evidence to say such a thing. If I did the same thing to Trump, however, he would have to prove I was lying to get anywhere, which is why you never see him sue over that kind of thing.