ABC’s “20/20” will interview John Edwards’ ex-aide, who initially claimed he, and not Edwards, fathered the baby of Edwards’ mistress Rielle Hunter.

Bob Woodruff’s interview with Andrew Young will air Jan. 29. YoPost staff writerung is promoting his book, “The Politician,” in which he recounts Edwards’ 2004 presidential run and his ’08 run, which ended when the Hunter scandal broke.

Edwards, who’s married, admitted the affair last year, but has denied fathering a child with Hunter.

Young’s book proposal reportedly says that Edwards did father the child.