Keaukaha, incorrect again.  Mueller did not convene or impanel a grand jury.  You are trying to make it appear like Mueller impaneled a grand jury because he has some hard evidence against someone.  It has been reported that Mueller has been or is using a grand jury that already was impaneled, but since grand jury proceedings are secret, no one really knows if he is using a grand jury and if so, why.  It could be to issue subpoenas for witnesses to testify or to review evidence to determine if a crime has been committed.  Instead of cheering for what you hope is Trump’s down fall, sit back, relax, let the Special Prosecutor do his job, wait for him to announce there is no evidence of Russia interfering in the 2016 election and no evidence of collusion between Russia and the Trump campaign, and then have your mental break down.