U.S. Defense Secretary James Mattis arrives at the start of a week-long Middle East visit at King Salman Air Base, Riyadh, Saudi Arabia, Tuesday, April 18, 2017. (Jonathan Ernst/Pool phto via AP)
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U.S. Defense Secretary James Mattis arrives at the start of a week-long Middle East visit at King Salman Air Base, Riyadh, Saudi Arabia, Tuesday, April 18, 2017. (Jonathan Ernst/Pool phto via AP)
