A source with knowledge of the incident said the cemetery official tried to prevent Trump staffers from filming and photographing in a section where recent U.S. casualties are buried. The source said Arlington officials had made clear that only cemetery staff members would be authorized to take photographs or film in the area, known as Section 60.

When the cemetery official tried to prevent Trump campaign staff from entering Section 60, campaign staff verbally abused and pushed the official aside, according to the source.

Incidentally, their response to this was in the NYT:

An official with the cemetery tried to “physically block” members of Mr. Trump’s team, Steven Cheung, a Trump campaign spokesman, said in a statement. Mr. Cheung added that the cemetery official was “clearly suffering from a mental health episode” and that the campaign was prepared to release footage of the confrontation to support its account of the clash. The campaign did not provide that footage after several requests.

Chris LaCivita, a top Trump campaign adviser, added in a separate statement that the cemetery official was “a disgrace and does not deserve to represent the hollowed grounds of Arlington National Cemetery.”

https://archive.is/REbXH#selection-901.0-905.206

Blaming mental illness on someone stopping them from exploiting recently dead service members for a political campaign is… pretty weird.