Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE on Wednesday night said that “a lot” of the Syrian refugees coming to the U.S. are members of the Islamic State in Iraq and Syria (ISIS).

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During an interview on Fox News's “O’Reilly Factor,” the presumptive GOP presidential nominee blasted his Democratic rival, Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE, and President Obama for not doing enough to stop the terrorist group in its infancy, when it could have been “wiped out quickly and effectively.”

“Now it’s a very large group of people and its only getting bigger and if [Clinton] gets in, it will be massive and we won’t even have a country anymore,” he said. “We will be afraid to walk outside.”

“One other thing,” Trump added, “they are letting tens of thousands of people come in from Syria and nobody knows who these people are and a lot of those people are ISIS.”

Trump argued that Clinton is not “tough enough” to defeat ISIS.

“She’ll never get tougher,” he said. “It’s not going to happen.”