A hearing in one of the four criminal prosecutions of former President Donald Trump took an unexpected turn Friday afternoon when a witness who had been relying on attorney-client privilege to refuse to answer numerous questions suddenly gave the judge overseeing the case reason to believe such privilege may not apply to him in the way that he thought. In question is whether Fulton County District Attorney Fani Willis should be disqualified from prosecuting Trump and others on charges related to election interference. Allegations of a long-running affair between Willis and Nathan Wade, the att…