CNN White House correspondent Jim Acosta said Friday that a source has told him that President Donald Trump is furious about Defense Secretary Jim Mattis’ resignation letter, tendered in the wake of the president’s decision to pull U.S. troops out of Syria.But Trump is even more incensed about news coverage indicating he needs adult supervision, Acosta told CNN’s Wolf Blitzer.“He hates that letter,” Acosta said, citing a source close to the White House who “advises the president occasionally.” But he added that Trump is even more upset by the “conventional wisdom” that Mattis and some others in his administration “were sort...