Johnson and Aiken presented the closing arguments for the defense. Johnson attacked the jurisdiction of a military tribunal over civilians, as had Mudd's attorney. Aiken also challenged the court's jurisdiction. He also reiterated that Lloyd and Weichmann were unreliable witnesses and that the evidence against her was all circumstantial. The only evidence linking Surratt to the conspiracy to kill Lincoln, he said, came from Lloyd and Weichmann, and neither man was telling the truth. (Dorothy Kunhardt has written that there is evidence the latter's perjured testimony was suborned by Secretary of War Edwin M. Stanton.)