“At his press conference, Bob [Mueller] had said that he intended to stick with the public report and not go beyond that,” AG William Barr said in an interview with Fox News. “And in conversations with the department, his staff was reiterating that that was their position and they asked us for guidance in writing to explain or to tell them [what] our position was. So we responded in writing. The department sent the guidance that they requested.”

Asked directly if it was Mueller who asked for the letter, Barr replied, “Yes.”

The letter said, “Should you testify, the Department understands that testimony regarding the work of the Special Counsel’s Office will be governed by the terms you outlined on May 29 — specifically, that the information you discuss during your testimony appears in, and does ‘not go beyond,’ the public version of your March 22, 2019 report to the Attorney General or your May 29 public statement.”

The letter, was signed by Associate Deputy Attorney General Bradley Weinsheimer.