Republican New Jersey Gov. Chris Christie was called a "fat ass" during his audition for a drive-time radio hosting job on WFAN, and retaliated by saying the caller was a "communist" and a "bum."

"Governor, next time you want to sit on a beach that is closed to the entire world except you, you put your fat ass in a car and go to one that's open to all your constituents, not just you and your family," the caller, identified as Mike from Montclair, New Jersey, said on the show.

Mike was referencing aerial photos taken of Christie and his family on a beach that was closed to the public during the state government shutdown, outside the state-owned governor's retreat during the July Fourth weekend.

Christie, who was unphased by the photos when asked about them last week, slammed Mike for swearing on the air.

"Interesting, Mike. You know, Mike, I love getting calls from communists in Montclair," the governor said.

"You're a bully, governor, and I don't like bullies," Mike responded.

"I'm not the guy who came on the air, swore on the air, and so… you're swearing on the air, Mike," he continued. "You're a bum."

Christie also said he would "love to come look at your optics every day, buddy" after Mike said the governor had "bad optics."

The New Jersey governor is auditioning to replace Mike Francesca, who is leaving WFAN at the end of the year.

After the photos of Christie and his family on the empty beach were published by a New Jersey newspaper, the governor's approval rating fell to an all-time low of 15 percent, according to a new poll from the Monmouth University Polling Institute.