Charles Krauthammer joined Fox News' Bill O'Reilly to discuss the Republican Indiana primary and after Bill fluffed up Donald for a while, then asked Krauthammer if the Republican establishment is "angry that Trump has got it?"

Krauthammer replied, "I have no idea what the so called establishment, if it exists, is thinking. I can tell you what I'm thinking."

O'Reilly was surprised that Charles didn't look angry, but in fact he "looked mellow tonight."

Bill then asked. " Are you gonna vote for Trump?" Krauthammer replied, "I have not decided what I'm going to do except for this - that I'm going, up until now, to state what I see now as the future of the party. Are we going to have a conservative program before us or not? I don't know, we'll see."

Bill stated matter of factly, that there will be a conservative platform in Cleveland during the RNC convention.

Krauthammer did say that what he heard from Donald so far, "I don't think I'd be capable voting for Donald Trump."

O'Reilly kept pushing him on why he couldn't vote for Trump if he presented himself like a "practical-popular-conservative."

"Why couldn't you vote for him?"

"Populist conservative is a contradiction in terms."

Snap!!!

BillO said he was a traditional populist an Charles bashed him again saying he wouldn't vote for him, either.

He then pushed back on Bill's insistence on the conservative platform.

"And there's a second issue. is his fitness for office. It's matter of temperament and up until now he's not impressed me with his temperament."

O'Reilly tried to get him to compare Trump's temperament with Clinton's and Charles stuck in the knife.

Krauthammer: "Well, it's different, you have to ask yourself, do I want a person of that temperament, control of the nuclear codes. And as of now I have to say no."

Krauthammer then defended his decision by highlighting Trump's crazy attack on Ted Cruz' father, saying he was associated with Lee Harvey Oswald.

Bill O'Reilly had to say no, "I believe he puts that out there just to create mayhem."

Krauthammer called out Bill for defending Trump's mayhem tactics and. Charles continued, "He wins it by floating conspiracy theories that you know and I know are in twilight zone. In the same way that he led the birther movement. That wasn't ancient history. That was five years ago."

Bill wasn't proud of the birther thing that Trump led, but said it gave him the good will of the nut-jobs who hate Obama.

Charles brought it back once again to his "temperament issues."

'Playing with absurd and kooky conspiracy theories is way beyond being unconventional. It is disturbing. And that's when you gotta ask yourself."

"Do you want someone who does that, in control of the nuclear codes."

Drop mic!