The person on whose shoulders the fallout from the staffing shortage rests most heavily is Brian Hook, the head of the department’s office of policy planning. A former adviser to Mitt Romney, Hook was a founder of the John Hay Initiative, a hawkish foreign-policy think tank whose other two founders, Eliot A. Cohen and Eric Edelman, were (and still are) among Trump’s most vociferous critics. Cohen and Edelman put their names on anti-Trump letters during the 2016 election; Hook didn’t.