James Mattis

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    Video caption: James Mattis mocks Donald Trump at gala dinner

    The former US defence secretary hits back after the president describes him as "the world's most overrated general".

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    Video caption: 'Syria withdrawal one bridge too far for Mattis'

    Former US Defence Secretary William Cohen reacts to the resignation of Jim Mattis.

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    Video caption: Mattis to Bolton: I hear you're the devil incarnate

    US Defence Secretary James Mattis jokingly tells new National Security Adviser John Bolton he's heard he is "the devil incarnate".