Remember, Barr hid the Russia report for a month. Refused to release it. Then wrote a one-page mischaracterization of the report and to this day there has been only a highly redacted version of the report.
Mr. Mueller wrote a letter to Barr stating that Barr's mischaracterization was significant, and that Barr got the conclusion wrong. Mueller said there were uncharged crimes in his report on Russia-trump. And that Trump absolutely could be charged with his crimes upon leaving office.
The Federal Judge ruled that Barr wrongly withheld parts of a Russia probe memo and lied about it.