U.S. Defense Secretary Visits Saudi Arabia [Getty Images]

RIYADH, SAUDI ARABIA - APRIL 19: Saudi Arabia's Deputy Crown Prince and Defense Minister Mohammed bin Salman (2nd L) takes his seat to meet with U.S. Defense Secretary James Mattis and his delegation on April 19, 2017 in Riyadh, Saudi Arabia. (Photo by Jonathan Ernst - Pool/Getty Images)

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