Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE on Tuesday slammed Republican rival Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE for the many controversies in which he's been involved.

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"The list is growing," Clinton told reporters on her plane after citing several incidents she said raised questions about Trump. "The Washington Post has a long list of many of the behaviors, the experiences, the activities that Trump has engaged in that raise serious questions."

Clinton said Trump had bankrupted his companies several times and had been sued "about 4,000 times."

She also hit the Republican nominee for the controversy surrounding Trump University.

"He's been accused repeatedly of fraudulent behavior. His so-called Trump University is under investigation right now because of the way it has scammed so many students who thought they'd get a better opportunity in life," Clinton said.

Clinton then referenced a $25,000 contribution the Trump Foundation made to Florida Attorney General Pam Bondi (R), which arrived at the same time she was deciding whether to investigate Trump University.

"We've recently learned that his Trump Foundation has been fined for illegal activity when it made a political contribution to the attorney general of Florida at the time she was being asked by her constituents to investigate Trump University," Clinton said, "because of the effects that these people that she's responsible for had experienced."

Clinton said there was a phone conversation between Bondi and Trump at the time.

"They contradict each other," Clinton said. "The American people deserve to know what was said because clearly the attorney general did not proceed with the investigation."

Trump has said he never spoke to Bondi about the donation from his foundation, which came when Bondi was deciding whether to investigate fraud claims by former students of Trump University. She ultimately decided not to pursue the case.

An official at the Trump Organization said Trump paid the IRS a $2,500 penalty this year after revelations that his charitable foundation gave an illegal political donation in 2013 to a campaign group linked to Bondi.

Trump said Monday that donation had nothing to do with his foundation's donation.

Clinton is making a final push for her campaign ahead of the general election, attempting to frame the GOP nominee is unfit for the presidency. Several recent polls between the two have shown the race appearing to tighten ahead of Election Day in November.