Santorum will be a guest on Wednesday's edition of the chat program.
"Santorum, who served as a U.S. Representative from Pennsylvania from 1991 to 1995 and later as U.S. Senator from the state from 1995 to 2007, is the author of the new book 'American Patriots: Answering the Call to Freedom,' which will be released the day before his 'Late Show' appearance," CBS said in a news release. "The book shares the true-life accounts of 25 unsung heroic men and women from the Revolutionary War era who fought and sacrificed to give future generations the freedoms enjoyed by the country today."
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