It's worth considering the case of Anwar al-Awlaki, an American citizen, that was killed by Obama outside of a combat zone. (I'm avoiding the word "assassinated" because it seems overly charged.)
In theory, some prosector could have decided to charge Obama with a crime, and maybe even achieved a conviction in a jurisdiction where he's unpopular.
This decision says that shouldn't happen because it was an official act as president.
Of course, if congress doesn't like something a president is doing, they can change the laws and remove his or her legal authority to do something.
In theory, some prosector could have decided to charge Obama with a crime, and maybe even achieved a conviction in a jurisdiction where he's unpopular.
This decision says that shouldn't happen because it was an official act as president.
Of course, if congress doesn't like something a president is doing, they can change the laws and remove his or her legal authority to do something.
https://en.wikipedia.org/wiki/Anwar_al-Awlaki