Allan Beale had already made news in the lead-up to the Farrer by-election on Saturday after being filmed trying to grab Liberal senator James Patterson's phone out of his hand in a testy street altercation.
The One Nation volunteer previously shared a Facebook post supporting Freeman that read: "Will the injured police officer ever be allowed to tell his story, or maybe he doesn't even exist??"
"For all to consider," Mr Beale commented.
He was also active in comments relating to Victorian neo-Nazi leader Thomas Sewell, praising him for pushing back against pro-Palestinian protesters.
"Back in my military days we would have certainly been more aggressive in ensuring long term injuries were imparted," Mr Beale said of the demonstrators.
Senator Hanson refused to directly condemn Mr Beale when questioned about his social media activity by reporters on Wednesday.
"He was invited there, he was a volunteer, it was a night of celebration," Senator Hanson said.
"I do not condone violence of any type or bullying."
MP-elect David Farley plucked the volunteer from the celebrating crowd during his victory speech, which he made on stage alongside Senator Hanson and New England MP Barnaby Joyce.
Mr Farley put his arm around Mr Beale and handed him the microphone.
One Nation senator Malcolm Roberts offered him a "good on you" and a firm handshake, while Senator Hanson gave him a hug.
