Republican presidential candidate Donald Trump in Dallas on June 16, 2016. Trump's campaign is struggling to raise money to finance his bid against Democrat Hillary Clinton. Ron Jenkins/Getty Images hide caption

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Court documents show the Internal Revenue Service's office in charge of vetting applications for tax-exempt status focused on conservative groups. Brendan Smialowski/AFP/Getty Images hide caption

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Democratic presidential candidate Bernie Sanders speaks during a rally in Washington, D.C., on June 9. Although he didn't win the nomination, Sanders' grass-roots fundraising has broken records. Alex Wong/Getty Images hide caption

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Will The Millions Of People Who Gave Money To Bernie Sanders Give To Democrats?

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An attendee hands a U.S. $2 bill to Donald Trump during a town hall event in Gaffney, S.C., on Feb. 18. Luke Sharrett/Bloomberg via Getty Images hide caption

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At Least 4 SuperPACs Are Jostling For Donald Trump's Seal Of Approval

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Democratic presidential candidate Bernie Sanders addresses a rally Wednesday at the Santa Clara County Fairgrounds in San Jose, Calif. The senator's campaign is intently focused on a big win in the state on June 7, and has poured money into TV ads there. Josh Edelson/AFP/Getty Images hide caption

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Donald Trump arrives at the Republican National Committee headquarters on Capitol Hill last week to meet with House Speaker Paul Ryan and other GOP leaders. Nicholas Kamm/AFP/Getty Images hide caption

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'Highly Sophisticated Killers' No More. Trump Embraces Big Donors

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The apparent Republican nominee, Donald Trump, at Trump Tower in Manhattan on the night of his victory in Indiana. View Press/Corbis via Getty Images hide caption

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Will Donald Trump Get Back The $38 Million He Lent His Campaign?

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A supporter of Democratic presidential candidate Hillary Clinton wears campaign buttons as she listens to former President Bill Clinton at an event in Indiana. Joe Raedle/Getty Images hide caption

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