I'm not a legal expert but is it a good sign when your main lawyer (John Dowd) resigns very shortly after the possibility of Trump being forced to testify was discussed in March? And no other major law firm would take the case either? Asking for a friend.
meanwhile
https://www.washingtonpost.com/politics/mueller-raised-possibility-of-presidential-subpoena-in-meeting-with-trumps-legal-team/2018/05/01/2bdec08e-4d51-11e8-af46-b1d6dc0d9bfe_story.html
Mueller threatened to subpoena Trump leading to chaos in DT's legal team. Now they have 49 questions that Mueller wants answered.
https://www.nytimes.com/2018/04/30/us/politics/questions-mueller-wants-to-ask-trump-russia.html