Fear: Trump in the White House by Bob Woodward:
The next day, Wednesday, May 17, Trump was in the Oval Office when he learned that Rosenstein had appointed Robert Mueller, who had run the FBI for 12 years, of all people, as special counsel to look into Russian election meddling and any connection to the Trump presidential campaign.
Trump’s mood deteriorated overnight and the next day, May 18, was the worst. The president erupted into uncontrollable anger, visibly agitated to a degree that no one in his inner circle had witnessed before. It was a harrowing experience. “We barely got by,” Porter said to an associate.
Normally Trump sat behind the Resolute Desk or in his private dining room. But this day he mostly stayed on his feet as he stormed between the two rooms.