Is a book written by philosopher Aaron James. His definition of an asshole is someone who allows "...himself to enjoy special advantages and does so systematically; does this out of an entrenched sense of entitlement; and is immunized by his sense of entitlement against the complaints of other people." (James used the masculine pronoun because he believed most assholes are men, but the book was published in 2012, way before Trump 1.0 and Trump 2.0, where we have seen that assholism is an equal opportunity condition.)
That definition is okay as far as it goes but a simpler, more accurate one is, "An asshole is someone who is willing to do ANYTHING to get what they want." Lying, cheating, stealing, killing - for an asshole, the ends always justify the means. They say things like, "Don't bother me with the facts, just give me the bottom line." or "There are no reasons, only excuses."
As for republicons, not all assholes are republicons, but all republicons are assholes, in the same way that while not all Masons are Shriners all Shriners are Masons. To be a Shriner one must be a Mason first. To be a true republicon, one needs to be an asshole.
(Note to anyone who thinks I am saying that Masons and Shriners are assholes, please go back to school and improve your reading comprehension.)