The fate of a final report on special counsel Robert Mueller III’s investigation took center stage at a Senate hearing Wednesday, as witnesses testifying on William Barr’s nomination as U.S. attorney general debated his commitment to sharing Mueller’s findings with the public.

The witness panel, featuring law professors, a former attorney general, and the leaders of civil rights groups, capped the nominee’s two-day confirmation hearing, which was mostly dominated by the topic of Mueller’s probe into Russian interference in the 2016 election.