"Recusal . . . it does not require a showing of actual bias. Rather, as the Supreme Court has explained, it simply asks whether “an objective observer” in the public “would have questioned [the judge’s] impartiality.” That is clearly the case with Cannon.. . . judge’s actions in the case would cause an objective observer to doubt the fairness of the proceedings."
https://slate.com/news-and-politics/2023/06/trump-indictment-remove-judge-aileen-cannon.html