Until this cycle, Bill Clinton has been a regular campaigner for fellow Democrats, not least his wife, but even as he assailed Republican ideas, he generally refrained from directly attacking his successors. As in previous years, the younger Bush has been out on the trail this fall, but has largely kept his post-White House campaigning to closed-door fund-raisers and studiously avoided criticising either Obama or Trump.
Obama’s criticism of Trump reflects a deep antipathy he feels for his successor, whom he called a “con man” and a “know nothing” during the 2016 campaign. Trump was the leading promoter of the lie that Obama was not born in the United States, a conspiracy theory that irritated the 44th president.