Gates: There Has 'Not Been Enough Sense of Urgency' on Russian Hacking

Support Mounts for Retired Gen. James Mattis as Defense Secretary

Former Pentagon chief Robert Gates calls Donald Trump's pick of Mattis 'terrific'

Former Defense Secretary Says New President Must Put Foot Down With Russia

Gates: Clinton's Email Server Was an 'Error in Judgment'

Gates: White House Doing Disservice to Troops By Avoiding Term 'Combat'

Gates: I Always Thought Obama's Notion That Nuclear Deal Would Change Iran Was a Stretch

Gates Isn't Sure There's Anyone Left in Obama Administration Who Can Speak Truth to the President

Gates: 'I Have Some Real Issues' With Trump on National Security

Gates Slams Trump's Foreign Policy: 'He Doesn't Listen to People'

Obama’s Former Pentagon Chiefs: Military Suffered From Overbearing, Inexperienced White House