Fear: Trump in the White House by Bob Woodward:
After 47 years, Dowd knew the game, knew prosecutors. They built cases. With all the testimony and documents, Mueller could string together something that would look bad. Maybe they had something new and damning as he now more than half-suspected. Maybe some witness like Flynn had changed his testimony. Things like that happened and that could change the ball game dramatically. Former top aide comes clean, admits to lying, turns on the president. Dowd didn’t think so but he had to worry and consider the possibility.
Some things were clear and many were not in such a complex, tangled investigation. There was no perfect X-ray, no tapes, no engineer’s drawing. Dowd believed that the president had not colluded with Russia or obstructed justice.
But in the man and his presidency Dowd had seen the tragic flaw. In the political back-and-forth, the evasions, the denials, the tweeting, the obscuring, crying “Fake News,” the indignation, Trump had one overriding problem that Dowd knew but could not bring himself to say to the president: “You’re a fucking liar.”