TV Critics Tour: Robin Roberts to take medical leave

Robin Roberts of "Good Morning America" said this morning at the TV critics tour that she'll take a medical leave by late August or early September. ABC News chief Ben Sherwood said Diane Sawyer, Barbara Walters and Katie Couric will all likely sub for her, and that other ABC talent -- notably Kelly Ripa and the women of "The View" -- have all offered to step in as well.

Asked how she was feeling -- Roberts will undergo a bone marrow transplant during her leave -- she said, "I go through moments of fatigue but this is one of those days where I'm a little more tired than I usually am." But she added that she's "truly energized" by "GMA's" string of wins over "Today."