The DOJ is appealing an order to release the full text of a memo used by former AG Barr to justify his decision not to prosecute Trump in the Russia probe.
His departure ends a nearly two-year run defined by his appointment of a special counsel to investigate connections between the Trump campaign and Russia.
Democratic Rep. Jerry Nadler of New York is asking for the information by May 1.
Ultimately, Mueller found Trump's inner circle saved him from himself. They refused to carry out orders that could have crossed the line into obstructing justice.
Mueller's report on the Russia investigation is two volumes and 448 pages long including attachments.
The redacted report from special counsel Robert Mueller has just been released to the public.