Rudy Giuliani demanded an apology from Fox Business host Kennedy on Tuesday evening and threatened to walk out of their interview after she compared him to British ex-spy Christopher Steele.
The president's personal attorney had been on the show to discuss Hunter Biden's laptop and the evidence he says is on it.
But when probed by Lisa 'Kennedy' Montgomery about the credibility of the documents in a line of questioning that compared him to Steele, Giuliani said: 'You got to be kidding me. I was acting like Christopher Steele?'
The former British spy's research alleged ties between Trump and Russia and was financed by Democrats. It contained unproven rumors about the president.
Kennedy said: 'Some can say that you're acting like Christopher Steele, that you were abstracting information.'
Giuliani hit back: 'You better apologize for that. I mean I've been a United States attorney, associate attorney general, mayor of New York City and a member of the bar for 50 years. I've never been accused of anything, and you're accusing me of being Christopher Steele.'
'What you're saying is an outrageous defamation of me, of my reputation', he added.
Giuliani had been on the show Tuesday to discuss Hunter Biden's laptop
He was then probed by Lisa 'Kennedy' Montgomery about the credibility of the documents in a line of questioning that compared him to Steele, pictured
The former NYC mayor then invited the host to come and see the evidence for herself.
He added: 'I came on your show in good faith to give you evidence that is being withheld from the American people, and I get defamed.
'This may be the last time we'll be on camera because I don't let people call me Christopher Steele.'
Giuliani is behind renewed allegations about Joe Biden's son Hunter and his foreign business ties. The New York Post says the emails were part of a trove of data recovered from a laptop that was dropped off at a computer repair shop in Delaware in April 2019.
The main email highlighted by the Post is an April 2015 message that it said was sent to Hunter Biden by Vadym Pozharskyi, an adviser to Burisma's board. In it, he thanks the younger Biden 'for inviting me to DC and giving an opportunity to meet your father and spent (sic) some time together. It's realty (sic) an honor and pleasure.'
The wording makes it unclear if he actually met Joe Biden. The Biden campaign said in a statement that it had reviewed Biden's schedules