Anthony Fauci, the former White House chief medical adviser, has expressed confidence in President Joe Biden‘s mental acuity, amid growing concerns within the Democratic party about his ability to lead. What Happened: In a recent interview, Fauci, who served as the head of the National Institute of Allergy and Infectious Diseases (NIAID) for almost four decades, vouched for Biden’s mental fitness, reported The Hill on Sunday. Fauci dismissed any medical conclusions drawn from a single event, such as a debate performance, and emphasized that he found Biden to be sharp and inquisitive in their i…