Donald TrumpDonald John TrumpSchiff urges GOP colleagues to share private concerns about Trump publicly US-China trade talks draw criticism for lack of women in pictures Overnight Defense: Trump to leave 200 troops in Syria | Trump, Kim plan one-on-one meeting | Pentagon asks DHS to justify moving funds for border wall 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 ClintonHillicon Valley: Trump pushes to speed up 5G rollout | Judge hits Roger Stone with full gag order | Google ends forced arbitration | Advertisers leave YouTube after report on pedophile ring 4 ways Hillary looms over the 2020 race Hillary Clinton met with Biden, Klobuchar to talk 2020: report 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.”