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U.S. Secretary of Defense Jim Mattis, left, and South Korea's Defense Minister Song Young-moo hold a joint press conference after the Security Consultative Meeting (SCM) at the Defense Ministry, Saturday, Oct. 28, 2017, in Seoul, South Korea. During the briefing, Mattis says the threat of nuclear missile attack by North Korea is accelerating. (Jung Yeon-Je/Pool Photo via AP)

U.S. Secretary of Defense Jim Mattis, left, and South Korea's Defense Minister Song Young-moo hold a joint press conference after the Security Consultative Meeting (SCM) at the Defense Ministry, Saturday, Oct. 28, 2017, in Seoul, South Korea. During the briefing, Mattis says the threat of nuclear missile attack by North Korea is accelerating. (Jung Yeon-Je/Pool Photo via AP)