There was some incidental contact. Calling this an assault or attack is stupid and ridiculous.
What Acosta did was refuse to hand over the mike to the young female intern by using his physical strength. There in he committed two crimes..(1) Ignoring protocol at White House News events (2) Physically pushing the Intern away who was simply trying to retrieve the mike.
So, not a physical assault enough to file a police report, but extremely rude and boorish behavior by a White House reporter. He must be banned for life from such events.