Democratic presidential candidate Hillary Clinton and Sen. Tim Kaine of Virginia greet the crowd during a campaign event on July 14 in Annandale, Va. Alex Wong/Getty Images hide caption

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Democratic presidential candidate Hillary Clinton and former U.S. president Bill Clinton greet supporters during a primary night gathering on April 26 in Philadelphia, where Clinton will return for the Democratic National Convention later this month. Justin Sullivan/Getty Images hide caption

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Sen. Bernie Sanders, I-Vt Bernie Sanders and Presumptive Democratic presidential nominee Hillary Clinton appear together at Portsmouth, N.H. High School where Sanders endorsed Clinton for president of the United States. Darren McCollester/Getty Images hide caption

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President Obama and Hillary Clinton walk off Air Force One in Charlotte, N.C., to attend a Clinton campaign event. The costs of that flight will be repaid by the Democratic National Committee. Nicholas Kamm/AFP/Getty Images hide caption

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Hillary Clinton addresses the U.S. Conference of Mayors on June 26. Clinton discussed her vision for American cities, but issues like that have been overshadowed by her email scandal. Aaron P. Bernstein/Getty Images hide caption

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Attorney General Loretta E. Lynch speaks at a June 22 news conference in Washington. Allison Shelley/Getty Images hide caption

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Attorney General Loretta Lynch, Bill Clinton Met Amid Email Investigation

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House Benghazi Committee Chairman Rep. Trey Gowdy, R-S.C. (left), confers with the committee's ranking member Rep. Elijah Cummings, D-Md., during a hearing on Capitol Hill. J. Scott Applewhite/AP hide caption

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Democratic presidential candidate Hillary Clinton (left) and Sen. Elizabeth Warren wave to the crowd before a campaign rally at the Cincinnati Museum Center at Union Terminal on Monday. John Sommers II/Getty Images hide caption

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Elizabeth Warren speaks at the Democratic National Convention on Sept. 5, 2012, in Charlotte, N.C. Joe Raedle/Getty Images hide caption

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Sen. Elizabeth Warren: From Professor To Pugilist

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