He and his co-author Alex Thompson spoke at 9:30 Club to a crowd eager to revisit the past. “You guys want me to sing, right?” quipped CNN’s Jake Tapper, as he and his co-author Alex Thompson, of Axios, settled into their seats onstage.

A book the CNN host co-wrote has received positive reviews and appears to be a sales hit. But it has also generated intense scrutiny of him and his work.

The Original Sin co-author discusses the former president’s decline and why it still matters amid Trump’s chaos.