In this Wednesday, June 20, 2018, file photo, U.S. Defense Secretary Jim Mattis, center, steps away after speaking with the media at the Pentagon. U.S. Defense Secretary Jim Mattis, who has accused China of "intimidation and coercion" in the South China Sea, is visiting Beijing as the countries increasingly spar over U.S. arms sales to Taiwan and Beijing's expanding military presence overseas. (AP Photo/Alex Brandon, File)
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