The political world was stunned on July 24, 2019, when Trump-Russia special counsel Robert Mueller testified before the House and Senate. It was not anything Mueller said that shocked observers — it was his demeanor. The 74-year-old special counsel appeared confused at times. He sometimes had difficulty answering the most basic questions. He had difficulty forming complex sentences.

The Mueller at the witness table was a far cry from the Mueller who took over the FBI 18 years earlier. Colleagues remembered a man who was super sharp, on top of everything, a micromanager. Now, many of those watching were concerned.