Burchett was one of the eight Republicans who voted to oust McCarthy as speaker last month.
NPR congressional correspondent Claudia Grisales posted a play-by-play of what she saw happen.
Hey Kevin, you got any guts!?'

U.S. CapitolGetty Images
Burchett lunged towards me.
I thought it was a joke, it was not.
And a chase ensued…
She wrote that Burchett then took off after McCarthy.

I chased behind with my mic, she wrote.
Burchett then yelled at McCarthy after catching up with him, she wrote.
Hey Kevin, whyd you walk behind me and elbow me in the back?
McCarthy, though, denied doing so.
Burchett yelled at him.
Youre pathetic man, you are so pathetic, he said to McCarthy, per Grisales.
In an interview with CNNs Manu Raju, Burchett confirmed Grisales account.
Hes a bully with $17 million and a security detail, he said.
McCarthy later told reporters that they were in a crowded hallway and he accidentally bumped into Burchett.
After Burchett spoke to CNN, anchors Kate Bolduan and John Berman did a dramatic reading of Grisales account.
The incident wasnt the only one on the Hill today.
The witness, Teamsters General President Sean OBrien, had tweeted about Mullin five times, the senator noted.
He read one post: Greedy CEO who pretends like he is self made.
In reality, just a clown & fraud.
Always has been, always will be.
Quit the tough guy act in these senate hearings.
You know where to find me.
Anyplace, Anytime cowboy.
We can finish it here.
OK, thats fine.
Perfect, OBrien responded.
Then Mullin said, You want to do it right now?
I would love to do it right now, OBrien said.
Well, stand your butt up then, Mullin said.
You stand your butt up big guy, OBrien said.
Mullin then stood up, before the committee chair, Sen.Bernie Sanders(I-VT) said, Stop it.
You are a United States senator.
This is a hearing.
God knows the American people have enough contempt for Congress, Sanders said.
Mullin and OBrien continued to have a verbal tiff while Sanders banged his gavel.
Comer used an expletive as Moskowitz took aim at Comers finances.
Comer also told Moskowitz, You look like a Smurf.