Newt Gingrich was hit with ethics violations at the end of his speakership, and Nancy Pelosi served on the committee that handled the investigation. Newt cleverly used her threat to reveal dirty secrets as a chance to taint the committee and its findings against him.

...I think what she said to you today should explain a great deal about what happened on the ethics process that Nancy Pelosi was at the heart of it and is now prepared to totally abuse the House process.