Donald TrumpDonald John TrumpTrump faces high stakes in meeting with Erdoğan amid impeachment drama Democrats worry they don't have right candidate to beat Trump Trump threatening to fire Mulvaney: report 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 ClintonHillary Diane Rodham ClintonDemocrats worry they don't have right candidate to beat Trump Krystal Ball credits Gabbard's upswing in 2020 race to 'feckless' Democratic establishment Outsider candidates outpoll insider candidates 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.”