Come Wednesday and Thursday, Attorney General Barr is scheduled to voluntarily testify before the Senate and the House Judiciary Committee about his handling of the Mueller Report.
However this might no longer be possible as typical Dem. Committee Chairman Jerrold Nadler tries to pull a fast one on A.G Barr by changing the previously set rules. Specifically one that includes Barr being questioned by members of the committee staff[Counselors].

“He [Barr] is not going to dictate the format of the Judiciary Committee,” Nadler told reporters. He said that each member having five minutes to ask questions followed by each parties’ Committee counselors having 30 minutes for questions is “a standard method of doing things.”
“In my judgment, it’s an effective way of doing things,” Nadler said. “And the witness is not going to tell the Committee how to conduct its hearing. Period.”

Although the DOJ objects to Nadler’s proposed method, the department spokesman Kerri Kupec told The Hill; “The Attorney General agreed to appear before Congress. Therefore, Members of Congress should be the ones doing the questioning. He [Barr] remains happy to engage with Members on their questions regarding the Mueller report.

House Judiciary Commitee republicans have condemned Nadlers choice of action towards A.G Barr, saying
“The only thing, apparently, that will satisfy Democrats, who refuse to read the less-redacted report, is to have staff pinch hit when a cabinet official appears before us,” adding that “Democrats have yet to prove their demand is anything but abusive and illogical in light of the transparency and good faith the attorney general has shown our committee.”