Bill O’Reilly and David Letterman high-five over the Iraq War

Occasional adversaries Bill O’Reilly and David Letterman appeared to have agreed on one issue at least during Thursday night’s broadcast of the “Late Show” --- the U.S. invasion of Iraq.

In a rare display of on-screen camaraderie, the agreement was then followed by a momentous high-five between the pair.

After Letterman argued that the Iraq War had turned the country into a “hotbed of terrorism,” O’Reilly agreed it was a regrettable action.

“I think that that was something that should not have happened in hindsight,” O’Reilly said.

“But I will say that I supported it because all the reportage was that Saddam Hussein did have these weapons.”

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The “O’Reilly Factor” host still took some convincing, however, as Letterman sprung from his chair and called for a celebratory high-five.

“I’m not gonna high-five you over a war,” O’Reilly explained. “We’re having a good conversation, sit down.”

After an awkward moment of silence, O’Reilly finally gave in.

Thursday night saw the two talk-show hosts in a much friendlier exchange than some of their previous ones.

In 2009, Letterman told O’Reilly, “I think of you as a goon,” and in 2006 he told him that “about 60 percent of what you say is crap.”