brian williams back on the air, while this story from the hollywood reporters says nbc chairman andy lack not convinced brian williams can return. one thing is certain, nbc's ratings have softened. it's fallen behind abc's "world news tonight with david muir" who just claimed his fourth week on top winning more total viewers as well as the coveted 25 to 54-year-old demographic. what's at stake? what are network execs thinking? calculating? what's the view from the anchor chair? joining me is carol simpson. >> good to be with you, frank. >> is there any way in your view that brian williams returns to that anchor chair? what do you make of andy lack's leaked nbc news chief wants brian williams back on the air which was contradicted by another leak not very long after that? >> i think brian williams has got to go and i think andy lack knows that he has to go. >> and you say that why?