If it was not breached then all is OK then, Department of Justice??
It is not whom is doing the investigation that matters, it is what are they investigating that matters.
They should be looking into extortion in favor of the clinton crime family foundation, misuse of classified information, obstruction of justice to name a few things not so much whether it was compromised. Frankly, it could have been compromised anywhere but the point is it would not have been so had it been properly secured.