Hillary Rodham Clinton

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Democratic presidential candidate Hillary Rodham Clinton listens to a question from a guest after a town hall meeting in Dover, N.H., Thursday, July 16, 2015. (AP Photo/Charles Krupa)

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Democratic presidential candidate Hillary Rodham Clinton addresses a gathering during a town hall meeting in Dover, NH., Thursday, July 16, 2015. (AP Photo/Charles Krupa)

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Democratic presidential candidate Hillary Rodham Clinton speaks at the National Association of Latino Elected and Appointed Officials in Las Vegas on June 18, 2015. (Associated Press) **FILE**

Democratic presidential hopeful Martin O'Malley is eager to challenge Hillary Rodham Clinton on the debate stage and to strengthen his national name recognition, but he will have to wait for the Democratic National Committee to schedule candidate face-offs. (Associated Press/File)

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In her highly touted economic policy speech on wage inequality and job creation Monday in New York, Hillary Rodham Clinton unexpectedly took what was seen as a sideswipe at Uber, Airbnb and other pioneers of the "sharing economy," saying the model left too many workers reliant on short-term contracts and freelance gigs without the benefits and protections of traditional jobs. (Associated Press)

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Donald Trump said his own complex political history, such as donations to Democrats including the Clintons, isn't proof that he is a wayward Republican but rather evidence that former first lady Hillary Rodham Clinton and any other politician can be bought — while he, a wealthy businessman, cannot.

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Presidential candidate Hillary Rodham Clinton decried "unsubstantiated" Republican attacks on her. (Associated Press)

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Jeb Bush and fellow establishment candidate Hillary Rodham Clinton are poised to finish the first half of the year with the most donations in a crowded 2016 field. (Associated Press)

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Democratic presidential candidate Hillary Rodham Clinton speaks to local residents during a campaign stop at the Iowa City Public Library in Iowa City, Iowa, on July 7, 2015. (Associated Press) **FILE**

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Hillary Rodham Clinton turned over to the State Department 55,000 pages containing some 30,000 emails from a larger collection. The remaining emails were deleted from her server, she said. (Associated Press)

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Hillary Rodham Clinton, a former first lady, senator and secretary of state. (Associated Press) ** FILE **

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The State Department said two dozen of the emails exchanged on Hillary Rodham Clinton's private server included classified information — potentially undercutting the former first lady's claims that she did not handle classified information on the secret account. (Associated Press)

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Sidney Blumenthal, a longtime confidant to former President Bill Clinton and Democratic presidential candidate Hillary Rodham Clinton arrives on Capitol Hill in Washington, Tuesday, June 16, 2015, to face questions from the Republican-led House panel investigating the deadly 2012 attacks in Benghazi, Libya. (AP Photo/Susan Walsh) (Credit)

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Democratic presidential candidate Hillary Rodham Clinton's campaign is hoping to have $1 billion on hand for her 2016 election campaign, which would require raising over $150 million per quarter. Sen. Bernard Sanders, meanwhile, hopes to turn his grass-roots support into campaign cash. (Associated Press)

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Sen. Bernard Sanders, Vermont independent, is surging ahead in early-polling states New Hampshire and Iowa, gaining on front-runner Hillary Rodham Clinton. (Associated Press)

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Democratic presidential candidate Hillary Rodham Clinton waves to supporters during a Jefferson Jackson event hosted by the Democratic Party of Virginia at George Mason University’s Patriot Center, in Fairfax, Va., Friday, June 26, 2015. (AP Photo/Manuel Balce Ceneta)

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Democratic presidential candidate Hillary Rodham Clinton, responds to the cheer of supporters at a Jefferson Jackson event hosted by the Democratic Party of Virginia at George Mason University’s Patriot Center, in Fairfax, Va., Friday, June 26, 2015. (AP Photo/Manuel Balce Ceneta)