By the time ABC aired an hourlong interview with James B. Comey on Sunday night, his feelings on President Trump were clear: that he was volatile, immoral, fixated on allegations made against him, akin to a mob boss.

When excerpts from Mr. Comey’s forthcoming memoir emerged last week, Mr. Trump pounced, labeling Mr. Comey “weak” and an “untruthful slime ball.” He later suggested Mr. Comey deserved jail time.

The disclosures in the book, many of which were amplified in extraordinary detail in Sunday’s interview, were a stunning assault on a sitting president by a former high-ranking law enforcement official.

[Read our full coverage of the interview »]

The ABC interview, conducted by the anchor George Stephanopoulos and filmed at Mr. Comey’s Virginia home, was the first major interview the former F.B.I. director has granted since his firing last May.