Former President Bill Clinton didn’t appear to remember his own impeachment during a recent interview about the novel he co-authored with James Patterson.

During an interview with CBS’s Mo Rocca, which aired on Sunday morning, Clinton opened up about his decision to write the book. He said, “To me it was, first of all, exciting. And because I’d never done it before I told everybody, ‘I’m an old dog, and this is a new trick.'”

The novel, “The President Is Missing,” begins with a president in danger of being removed from office. But when Rocca asked Clinton how he reflected on being impeached, the former president shrugged it off, saying, “I knew it wouldn’t succeed.”

Clinton went on to claim that he hadn’t done anything impeachable. He explained, “It wasn’t a pleasant experience. But it was a fight that I was glad to undertake. They knew there was nothing impeachable. And so, we fought it to the end. And I’m glad.” (RELATED: York: Trump’s Mueller ‘Witch Hunt’ ‘Is ‘A Page Out Of The Bill Clinton Handbook’)

But there was something impeachable, and Clinton was impeached on December 19, 1998. The Republican-led Congress voted 228-206 on the charge of perjury before a grand jury and 221-212 on the charge of obstructing justice.

He was later acquitted by the Senate and fought back against calls for his resignation, saying that he would serve “until the last hour of the last day of my term.”