Barr made it clear that it would be illegal for him to disclose anything that is currently subject to a grand jury investigation.
Gee, I wonder why …
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Any suspected violation of law that Mueller came across that was not related to Trump/Russia was to be turned over to other law enforcement agencies.
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Said other law enforcement agencies have the power of empaneling a grand jury.
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Mueller would note this in his report, so that related information in his report to the AG would be understood by the AG to be withheld from the public until said grand juries have concluded their work.