Robert Gates, who served under former Presidents George W. Bush and Barack Obama as Pentagon chief, was asked during his interview with CBS’s “Face the Nation” if former Vice President Joe Biden would be an effective commander-in-chief.

Gates had written in his memoir, Duty, how he thinks Biden has been wrong on every major foreign policy issue for the last 40 years. In the interview, Gates said he still stands by those remarks and said he does not know if Biden would make an effective commander in chief.