He's returned to the public eye in the past few weeks with a range of hawkish TV appearances and an editorial in the New York Post branding what he called Biden's "decision to deny Ukraine fighter jets" as "indefensible".
Axios insisted at the time that Bolton's claims "appear to have swayed more GOP senators in recent days, with some signalling they're more likely to vote for witnesses than before".
"For a guy who couldn't get approved for the ambassador to the U.N. years ago, couldn't get approved for anything since, 'begged' me for a non Senate approved job, which I gave him despite many saying 'Don't do it, sir,' takes the job, mistakenly says 'Libyan Model' on T.V., and many more mistakes of judgement, gets fired because frankly, if I listened to him, we would be in World War Six by now, and goes out and IMMEDIATELY writes a nasty & untrue book. All Classified National Security. Who would do this?"
Bolton "had become a vocal internal critic of potential talks between Trump and leaders of Iran" they said, and in 2018 he "masterminded a quiet campaign inside the administration and with allies abroad to persuade Trump to keep US forces in Syria".