A source present at the taping says James Comey's interview with ABC's George Stephanopoulos, airing Sunday at 10 p.m. as a "20/20" special, is "going to shock the president and his team."

The source said Comey's comments, in his first interview since being fired by President Trump last May, will generate headlines and "certainly add more meat to the charges swirling around Trump."

In an ABC promo, Stephanopoulos says Comey compared Trump to a mob boss.

According to the source:

The Comey interview left people in the room stunned — he told George things that he’s never said before.

left people in the room stunned — he told George things that he’s never said before. Some described the experience as surreal. The question will be how to fit it all into a one-hour show.

the experience as surreal. The question will be how to fit it all into a one-hour show. Comey answered every question.

every question. If anyone wonders if Comey will go there, he goes there.

What's next: Comey's book, "A Higher Loyalty," is out next Tuesday. He taped the interview Monday at his Washington-area home.

Get more stories like this by signing up for our daily morning newsletter, Axios AM.