Piers Morgan has sensationally claimed Sarah Ferguson has "backed him" after walking away from Good Morning Britain over his comments regarding Meghan Markle and Prince Harry's Oprah interview.In his Daily Mail column, the 56-year-old journalist exposed an encouraging text message from Prince Andrew's ex-wife, in which she says: "Get back out there!"READ: Holly Willoughby's advice to Piers Morgan after GMB exit revealedWATCH: Piers Morgan storms off GMB set halfway through showHe wrote: "'People