Prosecutors obtained the recording and played it for at least one witness who appeared this year before a grand jury in Washington. In the recording, Trump complains about Gen. Mark A. Milley, the chairman of the Joint Chiefs of Staff. I have a big pile of papers; this thing just came up,” Trump said, according to the person familiar with the transcript. Look, look at this. One key decision for Cannon, a Trump nominee, will be when to schedule the trial, a decision complicated by the political and legal calendar.