Barbara Walters will sit down with presidential candidate Donald Trump and his family for an hourlong interview set to air Friday night on "20/20," ABC said Tuesday. The wide-ranging interview will feature Trump's wife Melania in her first broadcast interview since her husband declared his presidential run, as well as Trump's children. A portion of the interview will air on "World News Tonight With David Muir" this week as well as other ABC News programs and platforms, including "Good Morning America" and "Nightline."