Defense Secretary Jim Mattis, walks to greet President Donald Trump's pick for national security adviser John Bolton, right, as Bolton arrives at the Pentagon, Thursday, March 29, 2018, in Washington. (AP Photo/Alex Brandon)
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Defense Secretary Jim Mattis, walks to greet President Donald Trump's pick for national security adviser John Bolton, right, as Bolton arrives at the Pentagon, Thursday, March 29, 2018, in Washington. (AP Photo/Alex Brandon)
