US Defense Secretary Jim Mattis resigned Thursday, a day after President Donald Trump shocked the US establishment by pulling out of Syria.
In a letter to Trump, Mattis suggested his world view, which favors traditional alliances and standing up to "malign actors," stands at odds with the president's.
"Because you have the right to have a Secretary of Defense whose views are better aligned with yours on these and other subjects, I believe it is right for me to step down from my position," Mattis wrote.
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