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Republican presidential front-runner Donald Trump appeared on "The O'Reilly Factor" tonight to defend his plan for preventing Muslims from entering the U.S.

Trump explained that he's calling for the temporary ban so that we can get to the bottom of what's going on with radical Islamic terror and what threat it poses to the U.S.

"It's a very, very serious problem, and somebody had to bring it up," Trump said. "Maybe it's not politically correct to do it, but somebody had to bring it up. And a lot of people are very thankful I did it."

O'Reilly asserted that Trump's plan would hurt the war on terror because we need moderate Muslim countries, such as Jordan and Egypt, to be our allies in the fight against radical Islam.

"You can vet them," O'Reilly said. "You can't insult a whole religion."

"We're not insulting. This is about security. It's not about religion," Trump answered. "We have a president that doesn't have a clue. He doesn't know what's going on. All I'm doing is bringing a situation to the forefront that everybody is talking about and nobody wants to do anything about it."

Watch part one of the "Factor" interview above and part two below.

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