Republican presidential front-runner Donald TrumpDonald John TrumpGOP-Trump trade fight boils over with threat to cars Trump: Meetings on potential North Korea summit going 'very well' Freed American 'overwhelmed with gratitude' after being released from Venezuela MORE is pinning blame for the Syrian civil war and the rise of the Islamic State in Iraq and Syria on Democratic presidential candidate Hillary ClintonHillary Diane Rodham ClintonTrump lashes out at 'rigged' Russia probe in pair of tweets Clapper: 'More and more' of Steele dossier proving to be true Republicans are strongly positioned to win Congress in November MORE.

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“She is the one that caused all this problem with her stupid policies,” Trump said on “Fox News Sunday.” “You look at what she did with Libya, what she did with Syria.”

“You look, she was truly, if not the, one of the worst secretary of States in the history of the country,” he added. “She talks about me being dangerous; she’s killed hundreds of thousands of people with her stupidity.”

Fox News host Chris Wallace questioned Trump about the claim.

“What do you mean, ‘hundreds of thousands?’” Wallace asked.

“She was secretary of State. Obama was president, the team,” Trump responded. “Two real geniuses.”

Clinton has publicly broken from the Obama administration on Syria since stepping down as secretary of State, advocating for increased U.S. involvement in the conflict, such as by implementing a no-fly zone.