U.S. Marine Corps veterans John Tiegen (left) and Mark Geist deliver a speech on the first day of the Republican National Convention on Monday. Joe Raedle/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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Bernie Sanders arrives for a press conference with union workers in East Lansing, Michigan, where he discussed the effect of free trade agreements on American workers. Scott Olson/Getty Images hide caption

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Democratic presidential candidate Hillary Clinton speaks during a caucus night rally at Drake University in Des Moines on Monday night. Patrick Semansky/AP hide caption

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Patrick Semansky/AP

Coin-Toss Fact-Check: No, Coin Flips Did Not Win Iowa For Hillary Clinton

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In 2014 photo, demonstrators chant pro-ISIS slogans in front of the provincial government headquarters in Mosul, Iraq. AP hide caption

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AP

Fact Check: Did Obama Withdraw From Iraq Too Soon, Allowing ISIS To Grow?

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Republican presidential hopefuls, retired neurosurgeon Ben Carson and real-estate mogul Donald Trump talk about childhood vaccines during the second Republican presidential debate. Frederic J. Brown/AFP/Getty Images hide caption

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Frederic J. Brown/AFP/Getty Images

Fact Check: Fiorina's HP Record; Trump's Bankruptcies; Vaccines And Autism

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Hillary Clinton waits behind a curtain before a rally at the University of Wisconsin, Milwaukee on Thursday. She continues to struggle to explain her use of a private email server while secretary of state. Morry Gash/AP hide caption

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Morry Gash/AP