Apparently, the reporter touched Trump with a pen in her hand.
That's plenty enough justification to react physically to check the possible threat while in a large crowd.
“Apparently, the reporter touched Trump with a pen in her hand.”
It was probably one of those cheesy little mics that plug into the phones. You see other Breibart “reporters” use them.
Considering that the Russian KGB operative was poisoned in London, one theory with the tip of an umbrella, that's not cool; she should have known better.