Opinionated - I'm not questioning whether Trump's presence was appropriate or legal, you are correct, he was invited by one of the mothers.

What was not appropriate and what angered veterans was that the Trump campaign, broke the rules and took video in Section 60 -- where recently buried U.S. service members are interred, and used it in a Trump campaign Tik Tok in which he criticizes Biden and Harris.

This quote from one of the veterans:

"Donald Trump has no right to use our most hallowed ground for his political aims," Fred Wellman, a 22-year Army combat veteran, said Wednesday. "For a lot of us, and I'm not the only one, people are aptly furious."

Federal law prohibits political activity, including any photography, at any military cemetery.