Mueller has convinced a judge to waive Manafort’s attorney-client privilege, so that his lawyer can testify before the grand jury.

“Essentially, the judge is saying that it is probable or likely that the clients had a criminal or fraudulent purpose in hiring the lawyer, even if (we would hope) the lawyer did not know it,” Gillers told POLITICO.

Further, once you can pierce the privilege, there’s no telling what information you can go on to discover. This decision will be useful in other contests to discover lawyer-client communications, even communications with different law firms, if any.

You don’t say.