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(Stephen Chernin/Getty Images)

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Copies of 'The 9/11 Commission Report' are seen for sale at Borders Books July 22, 2004 in New York City. (Mario Tama/Getty Images)

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Freshman U.S. Sen. Tom Cotton (R-AR) participates in a conversation about American foreign strategy and statesmanship at the Hudson Institute March 18, 2015 in Washington, DC. (Chip Somodevilla/Getty Images)

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A truck used to carry sand for fracking is washed in a truck stop on February 4, 2015 in Odessa, Texas. (Spencer Platt/Getty Images)

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US President Barack Obama (R) speaks with Sheikh Mohammed bin Zayed al-Nahyan (L), Crown Prince of Abu Dhabi, during the US-Gulf Cooperation Council Summit in Riyadh, on April 21, 2016. (JIM WATSON/AFP/Getty Images)

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Jens Weidmann, President of the Deutsche Bundesbank, attends the Sueddeutsche Zeitung economic forum at Hotel Adlon on November 16, 2012 in Berlin, Germany. (Thomas Trutschel/Photothek via Getty Images)

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US President Barack Obama (L) meets with Saudi King Salman bin Abdulaziz Al Saud at Erga Palace in Riyadh on April 20, 2016. (Pool/Bandar Algaloud/Anadolu Agency/Getty Images)

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(triitalian/Flickr)