An incompetent, lying grifter doofus who Trump listed by name as one of his foreign policy advisors to the Washington Post in March of last year. It's hard to downplay his role in the campaign once Trump did that.
Trump questions need for NATO, outlines noninterventionist foreign policy
Did you read the article? It explains how this guy ended up linked to the Trump campaign. No one disputes that he had a role of some sort as a foreign policy “adviser.” The guy was clearly desperate to be some kind of big shot, but he was a incompetent neophyte.