General McMaster was head of the National Security Council for a year under Trump. He has a new book out on his views on American Foreign Policy.
Nice summation can be found at: https://nationalinterest.org/feature/h-r-mcmaster%E2%80%99s-battlegrounds-fight-soul-us-foreign-policy-169383
This account is not anonymous and is direct, to the point, and largely leaves personalities out of it.