Lt. Col. Michelle Baldanza, a Pentagon spokeswoman, says William McRaven, former head of U.S. Special Operations Command, left the Defense Innovation Board on Aug. 20.
That was four days after he wrote in The Washington Post that Trump's actions revoking former CIA Director John Brennan's security clearance "embarrassed us in the eyes of our children, humiliated us on the world stage and, worst of all, divided us as a nation."
Trump revoked Brennan's clearance last month, saying he felt he had to do something about the "rigged" Russian election interference probe.
Copyright 2018 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.