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    McCaul: ISIS 'number one threat' to U.S.

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McCaul: ISIS 'number one threat' to U.S.

Rep. Michael McCaul, R-Texas, calls the militant group ISIS the number one threat to the homeland.

McCaul: ISIS 'number one threat' to U.S.

Rep. Michael McCaul, R-Texas, calls the militant group ISIS the number one threat to the homeland.