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Democratic presidential contender Bernie Sanders joined Stephen Colbert on "The Late Show" Wednesday night and took a swipe at Bill O'Reilly.

“Let me say something about Bill O’Reilly. Bill said - and this is a reason why people might want to vote for me - Bill said that if I won the presidency, he would move to Ireland,” Sanders said. “Electing me president is a twofer. You get Sanders and you got, you know, Bill to go to Ireland.”

So how did Bill O'Reilly react to Sanders' joke?

Watch the "Factor" clip above!

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