First 5 pages of a letter to Rod Rosenstein from William P Barr written on June 8th 2018. It is part of his submissions to the Senate Judiciary for his nomination proceedings scheduled for the15th and 16th of this month. It is the first document in attachment 12(C) and can be found here: https://www.judiciary.senate.gov/nominations/executive/pn-x1-116
Looks to me as if Barr is gonna lay down the law to Mueller and greatly limit the scope of his investigation.