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Donald Trump called Hillary Clinton "a world class liar" who thinks she is "entitled" to the presidency during a speech attacking his Democratic rival Wednesday.

"Hillary Clinton may be the most corrupt person ever to seek the presidency of the United States," Trump said in a speech at one of his properties in New York.

Trump homed in on Clinton's tenure as secretary of state, alleging that she used the State Department as "her own personal hedge fund." He cited a number of widely questioned arguments made in the anti-Clinton book "Clinton Cash" by conservative author Peter Schweizer that allege the Clintons used the government to amass personal wealth.

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Fact-Checking Trump's Speech

The presumptive Republican presidential candidate also cited Clinton's defense of the private email server she used as secretary of state and her now debunked claims of landing in Bosnia under sniper fire as first lady when making his case against Clinton.

"Her campaign slogan is 'I'm with her,'" Trump said. "You know what my response to that is? I'm with you: the American people."

But Trump will likely face questions about the accuracy of his own claims against Clinton. He said he opposed the war in Iraq, though there is no definitive account of him doing so. He also said Clinton’s email server was hacked, but there is no evidence of that. A number of other digs Trump took at Clinton's proposals -- especially when it comes to immigration and combatting terrorism -- were largely without merit as well.

One day earlier Clinton delivered a major address meant to undercut Trump's image as a successful businessman. "We cannot let him bankrupt America like we are one of his failed casinos," Clinton told a crowd in Ohio.

Notably, the Trump campaign deployed a number of quick fire responses to Clinton's address. It was a notable operational improvement since Monday's firing of campaign manager Corey Lewandowski.

Trump’s speech Wednesday, which he delivered using a teleprompter, was the first test run of what aides call “Trump 2.0.” The changes are meant to help the candidate appeal to Democrats and independents, as well sooth GOP concerns that the nominee’s campaign is in disarray.

And in doing so, the real estate mogul continued his direct appeals to Bernie Sanders supporters, saying he shares their belief that the country's political system is rigged.

"That's why we're asking Bernie Sanders' voters to join our movement: so together we can fix the system for all Americans...Because it's not just the political system that's rigged. It's the whole economy," Trump said.