FILE - In this Jan. 27, 2017, file photo, U.S. Defense Secretary Jim Mattis, right, and U.S. President Donald Trump walk into the Pentagon in Washington. Mattis is making his debut with a visit to staunch U.S. allies South Korea and Japan, both of which host tens of thousands of American troops and, for good reason, see North Korea as their biggest national security threat. (AP Photo/Susan Walsh, File)
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