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Glenn Beck appeared on "The O'Reilly Factor" tonight and butted heads with Bill O'Reilly over Donald Trump's conservative credentials.

Beck told O'Reilly that he simply doesn't understand the Trump phenomenon.

"Do you remember how I used to talk about how the progressives were in the Republican Party, as well?" Beck said. "That's Donald Trump!"

Beck noted that Trump voted for Obama in 2008, and hasn't shown the desire for a smaller, less invasive government.

O'Reilly pointed out that at that time he voted for Obama, Trump was primarily concerned with his business and constructing more buildings.

"Donald Trump is a unique politician," O'Reilly said. "You cannot put him in any other category. Either you like him or you don't like him."

He added that he doesn't believe for a second that Trump could be labeled a "progressive politician."

"Progressives, I know. He is a progressive!" Beck stated.

O'Reilly countered that Trump doesn't care about the government, per se, he's simply a problem-solver.

"I just don't think you're getting Trump's essence," O'Reilly said. "It's about two things: Blowing up the establishment - which he succeeded in doing on the Republican side - and problem-solving."

Watch more above.

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