Herman Cain says he's going to set the record straight now that someone's publicly detailed an alleged instance of his sexual misbehavior. Cain tells late night host Jimmy Kimmel that he'll fight the latest harassment allegations head-on because there is not an ounce of truth to the claims.

Cain plans to answer the charges at a news conference Tuesday afternoon in Phoenix. On Monday a Chicago woman graphically described an incident she said took place in 1997 when she sought job advice from Cain. At the time he headed the National Restaurant Association.

With her attorney Gloria Allred at her side, Sharon Bialek said she had hoped Cain would acknowledge the incident as wrong and apologize. She is the fourth woman who alleged that Cain engaged in inappropriate sexual behavior.