Earlier quoted context omitted.
Assange isn't American, isn't on American soil, and people in his position have been fair game for surveillance for approximately the entire existence of America. George Washington personally ran a spy ring: https://www.mountvernon.org/george-washington/the-revolution...
It says that all men are endowed these rights by a creator, which doesn't imply that nationality has anything to do with those rights. George Washington was the worst of the Founding Fathers, and didn't write the Declaration of Independence.
I don't think it makes any sense to read the Declaration as a pacifist document.