DAVID MUIR: And we do begin tonight with that stunning moment in court. The high drama playing out in Georgia late today. The prosecutor who brought the case against Donald Trump and his alleged co-conspirators taking the stand herself to defend herself. The dramatic moment when D.A. Fani Willis showed up in the courtroom today, insisting she wanted to testify, crossing the room there to the witness stand. Taking the oath. On the stand, Willis was defiant, fielding questions about alleged misconduct. At one point, though, Willis telling the lawyer, questioning her, “You're confused. You think I'm on trial, these people are on trial for trying to steal an election in 2020”. But could Fani Willis be removed from the case? And what happens to the case against Trump if that happens?