Former Defense Secretary Jim Mattis is warning that bitter political divisions threaten American society, saying he views “tribalism” as a greater risk to the nation’s future than foreign adversaries. 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 Wednesday by The Wall Street Journal.
