Absolutely. My guess is he asked if he could come. Also, the Secret Service would need to send an advance team and they’d have found out any negatives. I suspect Trump is a very polite man and would not show up at a family event without asking.
A man like Trump can’t just go somewhere without planning because of security.
1 day ago:
“President Trump is moved by the invitation to join NYPD Officer Jonathan Diller’s family and colleagues as they deal with his senseless and tragic death,” Trump campaign spokesperson Karoline Leavitt said in a statement.