Tonight on AC360: Cain's changing story

Editor's note: At 8 p.m. ET, Anderson Cooper has in-depth reporting on the scandal surrounding Herman Cain's campaign, and the consequences.

Washington (CNN) – Republican presidential candidate Herman Cain on Tuesday blamed the passage of time for his inconsistencies in recalling the details of a sexual harassment allegation made against him in the 1990s.

“This was 12 years ago and I was trying to recollect this in the middle of an already busy planned day,” Cain told HLN, CNN’s sister network, in an interview Tuesday. "After 12 hours during the day, I was able to gradually recall more and more details about what happened 12 years ago. … I wasn't given the opportunity to think about it for the day before starting to answer questions."

Cain, who served as head of the National Restaurant Association from 1996 and 1999, spent much of the day Monday responding to a POLITICO report alleging that two female employees at the association accused him of inappropriate behavior during his tenure.

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