Donald Trump’s campaign was warned about not taking photographs before an altercation at Arlington National Cemetery during a wreath-laying ceremony earlier this week to honour service members killed in the Afghanistan War withdrawal, a defense official told The Associated Press on Wednesday.

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“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 cemetery officials’ statement said. “Arlington National Cemetery reinforced and widely shared this law and its prohibitions with all participants. We can confirm there was an incident, and a report was filed.”