The email states:
In response to your emails below we have consulted with executive management here, including the General Counsel, and recommend the following
That your counsel convey any acceptance or declinations to invitations to testify directly to the Committees.
That your counsel consult with Special Counsel Mueller to determine the timing of any such testimony and, [Emphasis added]
The Office of General Counsel stands ready to discuss with you in consultation with the Department of Justice and the Special Counsel, institutional privileges or prerogatives that may be presented by any such testimony.
The actual email doesn't seem to match the intent of the headline. If there was an ongoing investigation, and there was, it wouldn't be out of the ordinary to consult with the investigator to insure there was no contamination of that investigation. But the email doesn't even go that far. It talks about timing, privileges or prerogatives that may be presented.
While there could very well have been unethical conspiracies between the FBI and Mueller to destroy Trump, this email doesn't indicate that
