Arnold went to the West L.A. division of the LAPD on Monday morning and made a report for battery, said LAPD Officer Rosario Herrera.
Arnold tweeted: "Mark Burnett just went apest and choked me at this huge Emmy party then he ran away with his torn pink shirt and missing gold chain. I'm waiting for LAPD".
"Is your TV show worth it Tom?" she asked.
Arnold replied to Downey's tweet, calling her a liar. "Bullshit. You lie your insane husband attacked me you psycho", he wrote. "I'm filing a police report & suing you for defamation". Police haven't yet responded to a request for comment, according to The Hollywood Reporter, but Arnold's lawyer alleged that Burnett "attacked" his client.
It's unclear if Patton Oswalt saw the fight itself, but afterwards he tweeted that he was "with Tom Arnold", and that the host was safe. He's okay. We gotta protect this brutal angel. The actor has a new Viceland show called The Hunt for the Trump Tapes with Tom Arnold, which chronicles his quest to uncover the potentially damaging tapes of the now-president during his Apprentice days.
Some have speculated the fight was a publicity stunt.
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Arnold has been going after Burnett over his association with Trump and his hand in producing "The Apprentice" for some time.
The 59-year-old actor was reportedly involved in an altercation with Mark Burnett - who he has repeatedly accused of concealing the 'Trump Tapes'. "Mark Burnett says he's a Christian and he lets that man do all this bullshit and he's in this town making money and people are working?"
Burnett says he's "not pro-Trump," despite Trump's own tweets to the contrary.
Arnold also claims that there was a fourth person, filmmaker Bryan Fogel, who witnessed the entire ordeal, and started to filmed it before Downey knocked his phone from his hand. "I don't have that word in my vocabulary, and never have".
"Mark Burnett, Tom Arnold is there anyway that we could get together and talk?"