An ABC 20/20 report about a Washington D.C. "escort service" is expected to draw top ratings when it airs Friday night during the May sweeps. The exposé has already resulted in the resignation of Deputy Secretary of State Randall Tobias, after ABC's investigations unit, headed by Brian Ross, found his name in the madam's phone records. Additional resignations could come before the broadcast airs, some reports speculated, producing further free publicity for it. Meanwhile, last Friday's 20/20, featuring an hour-long report by Barbara Walters about transgender children, placed second among overall viewers, but, in an anomaly for a news magazine, which usually draws older viewers, placed first among adults 18-49.