Robertson was asked to opine on Fox News' "Hannity" about how to combat radical Islam and anti-Christian behavior, after ISIS militants released a video showing the beheading of a second American journalist.
"In this case, you either have to convert them -- which I think would be next to impossible," Robertson said. "I'm not giving up on them, but I'm just saying either convert them or kill them. One or the other."
Host Sean Hannity predicted the media would jump on that comment.
"I'd much rather have a Bible study with all of them and show them the error of their ways and point them to Jesus Christ ... however, if it's a gunfight and a gunfight alone, if that's what they're looking for, I'm personally ready for either one," Robertson later added.
It so happens that convert-or-die was the same ultimatum ISIS militants gave to Iraqi Christians after taking control of Mosul.
Robertson is making the media rounds to promote his new book, which defends comments he made on homosexuality in a GQ interview last year.
"I’m as much of a homophobe as Jesus was," Robertson said on "Good Morning America" while addressing the outcry over the remarks. "People who are participating in homosexual behavior, they need to know that I love them."
Watch below, courtesy of Fox News: