Fox News host Bill O'Reilly on Tuesday night defending describing the opponents of same sex marriage as "Bible thumpers," saying it was both accurate and honest.

The conservative Fox News host made the comment last week while discussing two cases before the U.S. Supreme Court. On his show Tuesday night, Fox News contributor Laura Ingraham criticized O'Reilly for using the term "Bible thumper."

"If you're going to stand up for heterosexual marriage and exclude gay marriage, if you're going to do that, you've got to do it outside the Bible," O'Reilly explained. "You can't cite the Bible because you will lose if you do."

Ingraham told O'Reilly it was "disrespectful" to suggest Christians couldn't cite the Bible, but was quickly interrupted by the infamously vocal host.

"In their private life they can," he shouted. "We're talking about policy here. Don't you understand the difference between private beliefs and public policy? I guess you don't understand because you've done it twice."

Ingraham also questioned why O'Reilly used the word "thumper."

"Because that's the way you get it across" O'Reilly responded. "There are Bible thumpers and all they do is say, 'I object to gay marriage because God objects to it.' You don't win a policy debate in America with that."

Watch video, uploaded to YouTube, below: