defense secretary james mattis defense secretary james mattis

The Pentagon plans to build temporary camps for detained immigrants. Here, children of detained migrants are seen at a tent encampment near the U.S. Customs and Border Protection port of entry in Tornillo, Texas. Jose Luis Gonzalez/Reuters hide caption

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Jose Luis Gonzalez/Reuters

U.S. Defense Secretary Jim Mattis (right), with Afghan President Ashraf Ghani, arrived in Kabul on Wednesday. A rocket attack targeted Kabul's main airport on the same day. Rahmat Gul/AP hide caption

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Rahmat Gul/AP

Defense Secretary Jim Mattis seems to be aiming to reassure U.S. allies while overseas. Ahead of an unannounced visit to Iraq, Mattis rejected President Trump's statements that the U.S. should have seized Iraqi oil after the invasion. Susan Walsh/AP hide caption

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Susan Walsh/AP

U.S. Secretary of Defense Chuck Hagel (left) walks with Vice Adm. Robert Harward (center), the deputy commander of U.S. Central Command, and Col. Kelly Martin, the vice commander of 6th Air Mobility Wing, after landing at MacDill Air Force Base in Tampa, Fla., in 2013. Erin A. Kirk-Cuomo/DoD hide caption

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Erin A. Kirk-Cuomo/DoD