A top deputy to Special Counsel Robert Mueller, Andrew Weissmann, revealed in a book he published last year that the team he headed prepared a summary of all its work — apparently including details not contained in the final report made public in 2019.

“At least for posterity, I had all the [team] members … write up an internal report memorializing everything we found, our conclusions, and the limitations on the investigation, and provided it to the other team leaders as well as had it maintained in our files,” wrote Weissmann in “Where Law Ends: Inside the Mueller Investigation.”…

The pledge to process the so-called alternative Mueller report is no guarantee that what’s released will contain significant new revelations. The Justice Department can use a variety of exemptions to the Freedom of Information Act to shield parts of the document from disclosure, including by deeming it attorney work-product or part of an internal deliberative process. Current DOJ leaders could waive those exemptions, but releasing other contents such as grand jury information could be more difficult due to legal restrictions.