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Tonight on On the Record, Greta Van Susteren grilled Donald Trump about what he would do about radicalized Muslims already living in the U.S.

"We've already got so many of those people that you would now seek to ban," Van Susteren said. "They're already in the United States. What would you do -- you gonna go round them up? What would you do with the people and how do you handle the fact that so many are lawful?"

Trump emphasized that his ban on incoming Muslims was temporary and said that Muslims in the U.S. need to report suspicious behavior to authorities.

"It always turns out that other people knew," he said, saying that it looked like Omar Mateen's wife and father knew that an attack would happen.

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