NEW YORK (AP) — ABC News plans to air an interview with the second wife of Republican presidential contender Newt Gingrich on "Nightline" just two days before the GOP's South Carolina primary.

Excerpts from the interview with Marianne Gingrich will be released during the day Thursday, ABC News spokesman Jeffrey Schneider said, ahead of both a Republican candidate debate Thursday evening in Charleston, S.C., and ABC's late-night news program.

ABC News has not indicated what Marianne Gingrich said in the interview. Her ex-husband has said that they don't have a relationship.