Comey goes on saying, "I was floating above myself, looking down, saying, 'You're sitting here, briefing the incoming president of the United States about prostitutes in Moscow,'" Comey said.
Trump fired Comey in May 2017, 10 months into the investigation of possible collusion with Russia by the Trump campaign during the 2016 presidential election.
According to a trailer advertising the interview, Comey is also asked about the investigation into Hillary Clinton's use of a private email server, and whether he has information that would be hurtful to the president.
Comey will kick off a publicity tour for the book Sunday, coinciding with the Stephanopoulos interview, which will be the first of several scheduled over the next few weeks.
Sunday’s interview will be the first of several scheduled for the next few weeks following the release of the book.
Here’s what to know about the interview:
Who is interviewing Comey: George Stephanopoulos is conducting the interview.
What time: The interview is set for 10 p.m. ET
What channel: ABC is airing the interview. It is a special "20/20" episode.
What you may not know: According to ABC, the interview lasted five hours and Comey answered every question Stephanopoulos posed.