The retired Marine general, who resigned in December 2018 in a policy dispute with President Donald Trump, said he worries about the state of American politics and the administration’s treatment of allies.
“We all know that we’re better than our current politics,” Mattis wrote in an essay adapted from his new book and published on Wednesday by The Wall Street Journal.
“Unlike in the past, where we were unified and drew in allies, currently our own commons seems to be breaking apart.”
Mattis said the problem is made worse by this administration’s disregard for the enduring value of allies, which he alluded to in the resignation letter he gave Trump on December 20.
“Nations with allies thrive,” he wrote in the Journal essay, “and those without them wither. Alone, America cannot protect our people and our economy. At this time, we can see storm clouds gathering.”
In an apparent reference to Trump, Mattis added: “A polemicist’s role is not sufficient for a leader. A leader must display strategic acumen that incorporates respect for those nations that have stood with us when trouble loomed.”
Mattis is breaking months of public silence as he promotes his new book, “Call Sign Chaos: Learning to Lead,” which is scheduled to be published on September 3.
Without citing Trump by name, Mattis suggested the administration and its strongest critics are engaged in destructive politics.
He said he worries more about internal divisions in American society than about external threats.
“We are dividing into hostile tribes cheering against each other, fuelled by emotion and a mutual disdain that jeopardises our future, instead of rediscovering our common ground and finding solutions,” he said.
“All Americans need to recognise that our democracy is an experiment – and one that can be reversed,” he wrote, adding, “Tribalism must not be allowed to destroy our experiment.”
Regarding his reasons for leaving the Trump administration, Mattis offered a slightly more pointed explanation than he outlined in his resignation letter.
“When my concrete solutions and strategic advice, especially keeping faith with our allies, no longer resonated, it was time to resign, despite the limitless joy I felt serving alongside our troops in defence of our Constitution,” he wrote.
Mattis, who had never met or spoken to Trump before the Republican president-elect interviewed him for the Pentagon job in November 2016, quickly became known as a leading voice of reason and stability in an administration led by an impulsive president unfamiliar with the tools of statecraft and dismissive of allies’ interests.
Mattis resigned shortly after Trump announced he was pulling all US troops from Syria.
In Mattis’ view this amounted to betraying the Syrian Kurdish fighters who’d partnered with American troops to combat the Islamic State group.
Trump later backed away from his decision, allowing a portion of the US force to remain in Syria in what the Pentagon sees as an effort to prevent a resurgence of the Islamic State group.
In his resignation letter, Mattis emphasised the value of allies and suggested that Trump had been irresolute and ambiguous in his approach to Russia and China.
Trump said after Mattis left on December 31 that the former Marine general had done a poor job managing the war in Afghanistan.
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