You still are not making sense.   Are you deliberately trying to be the rear end of a horse?
Mueller is apparently forcing lawyers to testify against their clients.  What is next, forcing reporters to give up their sources or priests to violate the sanctity of the confessional?
  le postérieur d'un cheval.
 https://www.washingtonpost.com/world/national-security/mueller-willing-to-use-suspects-lawyers-against-them/2017/10/31/6b09e98a-be6f-11e7-959c-fe2b598d8c00_story.html?utm_term=.77407e6aa1d1