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Although he was known as a scholarly and deeply reflective officer, Trump latched on to Mattis’s reputation and, uncomfortably for Mattis, a nickname that he deeply disliked: “Mad Dog.” When Mattis was introduced to a crowd for the first time as Trump’s nominee, Trump delighted in the fact that the crowd started chanting, “Mad Dog! Mad Dog!” Almost from that point forward, the mismatch—the oil-and-water personalities of the superficial, glib, impetuous Trump and that of his intellectual, measured, deeply principled secretary of defense—began to slowly fall apart. For Mattis “it was just a matter of time.” The split finally occurred in 2018, following President Trump’s decision to withdraw US troops from Syria and abandon America’s long-standing and courageous Kurdish allies.
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David Rothkopf (American Resistance: The Inside Story of How the Deep State Saved the Nation)