Bill O'Reilly appeared on "The Daily Show with Jon Stewart" Thursday night to promote his new book and tease the duo's upcoming mock debate dubbed, "The Rumble in the Air-Conditioned Auditorium."

The debate will take place at George Washington University in Washington D.C. on Saturday, October 6 at 8:00 p.m.

Stewart first asked O'Reilly how things were over at Fox News after Mitt Romney won the first presidential debate. Stewart joked, "You think there'll be a Fox News, Obama debate baby boom?"

The conversation turned to O'Reilly's new book. "Killing Kennedy," Stewart said. "This is, I'm assuming, you're confessing to something here?"

O'Reilly said that his previous book, "Killing Lincoln" was "a huge success" so he decided to write about Kennedy.

"Humility is an important quality in an author," Stewart quipped. "'Killing Lincoln,' 'Killing Kennedy,' I assume, 'Killing Garfield?' The president or the cat?"

"No," O'Reilly said of his next book. "'Killing Colbert.'"

"You have crossed the line!" Stewart yelled. "You are so going down Saturday night."

O'Reilly and Stewart shared their debate preparation plans. Stewart is preparing with Stephen Colbert and a chicken, O'Reilly with a professor. "Do you see me as Mitt Romney?" O'Reilly asked.

"No I think you're like the Abominable Snowman," Stewart said. "All I have to do is get out of your peripheral vision and I'm fine."

WATCH: