https://turcopolier.typepad.com/sic_semper_tyrannis/2019/04/who-does-john-bolton-actually-work-forby-willy-b-a-review-of-publicly-available-reporting-that-i-have-accumulated-in-my-fi.html#more

Summary: Bolton appears to be a careerist, more interested in serving Sheldon Adelson than in serving the USA.