Meanwhile, Trump was trying to set up a photo-op that would show him respecting military fallen at Arlington National Cemetery, a federal site with very specific rules about conduct and photos:

“Federal law prohibits political campaign or election-related activities within Army National Military Cemeteries, to include photographers, content creators or any other persons attending for purposes, or in direct support of a partisan political candidate’s campaign,” the statement said, adding that “a report was filed” over the incident.

“Arlington National Cemetery reinforced and widely shared this law and its prohibitions with all participants,” the statement said.

The staffers were trying to video Trump laying a wreath in a ceremony for 13 US service members killed in a suicide bombing in Afghanistan.

In a statement, Arlington acknowledged one of its representatives became involved in the altercation with two Trump staffers, telling them that only cemetery representatives were allowed to take video and photographs in Section 60, an area where recent US casualties mostly from Iraq and Afghanistan are buried.

The Trump staffers pushed aside the cemetery official, who would be a civilian US Army employee, verbally abused them, and went ahead posing and taking photos like this and this video. In the video he was apparently speaking to the family of that fallen soldier, but the family can't give him access with private photographers to the grave.
So in his usual Trump style, the event is characterized as the employee being mentally disturbed and shouldn't have a job there.

“For a despicable individual to physically prevent President Trump’s team from accompanying him to this solemn event is a disgrace and does not deserve to represent the hallowed grounds of Arlington National Cemetery,”. . .

On a personal note, I was one of those public-facing park rangers many years ago when a local NY US congressman and a couple of friends rode out to Ellis Island on an Army Corps of Engineers tug (not a boat authorized to land at or transport people to the national park). The boat captain was the brother-in-law of the congressman. This was before Ellis restoration, when there was a lot of dangerous building decay and tours followed a set route with covered walkways and barriers; they walked all over the place and when I found them I tried to get them to return to their boat. They in turn patronized, insulted, and dismissed me; my supervisor heard of this and tagged along the rest of the time (so they wouldn't kill themselves) as they did what they wanted, asserting privilege based upon the congressman's status as an elected official. I was so pissed off that I wrote the Case-Incident report to include dialog - how rude they were, and how they suggested I should just go away and be a good little girl, that the Congressman had a right to do what he wanted. I was reading a lot of Steinbeck at the time so I quoted our conversation as dialog in the way he would have. Clear, and interesting to read.

The federal report forms documenting their trespass and abuse, written by me and by my supervisor and appended with a report from the Supt of the monument, moved up through NPS ranks and landed on a desk somewhere in Washington. In the end, the Corps of Engineers and the Congressman's office had to offer me a written apology. When you know your site, and you know the regulations, and when the misbehavior is challenged, it can come back to bite the offender in the ass. There's a reason for all of the federal regulations and the reports we had to file. On the bottom of my report I was allowed to state that I felt it was reprehensible for employees of another federal agency to behave that way on our site. The Arlington National Cemetery is run by the Army, and they're more strict about regulations than NPS. Trump's group could end up getting a citation or something out of this, if anyone bothers to follow-up.