Rage by Bob Woodward:
But Coats continued to harbor the secret belief, one that had grown rather than lessened, although unsupported by intelligence proof, that Putin had something on Trump. How else to explain the president’s behavior? Coats could see no other explanation. He was sure that Trump had chosen to play on the dark side—the moneyed interested in the New York real estate culture, and international finance with is corrupt, anything-to-make-a-buck deal making. Anything to get ahead, anything to make a deal.
Coats realized that Trump had been able to make a deal with him, a raw political deal—hold that resignation for now, we’ll do it later, soon, but without a tweetstorm against you. He had played into Trump’s protection racket.
Coats saw how extraordinary it was for the president’s top intelligence official to harbor such deep suspicions about the president’s relationship with Putin. But he could not shake them.