Out of the loop

What I think I know : They tried to take a picture at Arlington National Cemetery, but couldn't? There was a physical altercation maybe? But the Trump campaign said there wasn't?

Is there more to this? Can someone explain to me the context of how this is a scandal?

Like I hate Trump but I don't understand why this is a big deal. It doesn't seem to involve the man personally, just some staffers who had an argument with a cemetery worker, and seems like small potatoes compared to other scandals he's had. Is it because of how sacred the cemetary is, or did they get into an actual fist fight, or did Trump personally interfere in some way?