WASHINGTON — Former “Apprentice” star Omarosa is putting the White House on notice as she makes her exit: She has “quite a story to tell” about her time in President Trump’s administration and “the world will want to hear it.” Accustomed to the spotlight, Omarosa Manigault Newman appeared on national television Thursday to push back against reports that she was fired from her job as a Trump assistant and director of communications for a White House office that deals with constituent groups. She also denied reports that she made a spectacle of herself while being escorted from the White House grounds, calling the stories “100 percent false” and questioning why photos or video of her alleged misbehavior had yet to surface. Better known by just her first name, Manigault Newman told ABC’s “Good Morning America” that she resigned this week after discussing some of her concerns with White House chief of staff John Kelly.