A 19-year-old Nevada college student confronted Jeb Bush at an event in Reno yesterday, at one point claiming that "your brother created ISIS." 

Ivy Ziedrich took issue with Bush's argument at the event that President Obama's withdrawal from the Middle East led to the rise of ISIS. 

She told him he was wrong and that a key decision by President George W. Bush after the U.S.-led invasion of Iraq is more to blame. 

“[ISIS was created] when 30,000 individuals who were part of the Iraqi military were forced out — they had no employment, they had no income, and they were left with access to all of the same arms and weapons,” Ziedrich said.

"Is that a question?" he responded.

Ziedrich fired back: "you don't need to be pedantic to me, sir."

"Pedantic? Wow," Bush said, before defending his position on ISIS. 

"Al Qaeda had been taken out. There was a fragile system that could have been brought up to create, to eliminate the sectarian violence and we had an agreement the president could have signed. It would've kept 10,000 troops [in Iraq]," said Bush. 

He suggested Ziedrich was "rewriting history" and added that "the simple fact is that we're in a much more unstable place because America pulled back." 

Jeb Bush has not officially declared his presidential run yet, but he made headlines earlier this week when he defended his brother's foreign policy decisions in an interview with Megyn Kelly. 

Also in Reno yesterday, Bush seemed to slip up momentarily when he told reporters, “I’m running for president in 2016, and the focus is gonna be about how we – if I run – how do you create high-sustained economic growth." 

He still maintains he has not made up his mind about whether to run. 

A new Fox News poll (below) puts Bush ahead of the other GOP contenders in hypothetical matchups against Hillary Clinton.

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Watch the confrontation above, along with the "America's Newsroom" discussion.