NEW TIME SLOT: By staying still, Tucker Carlson keeps moving at Fox News. When Megyn Kelly left the network to join NBC, he inherited her prime-time program slot. And beginning tonight, now that Bill O’Reilly is no longer part of the network he helped establish, Carlson inherits the plum leadoff spot at Fox News. How he addresses and describes that transition, and what he does and doesn’t say about the disgraced departure of his former colleague, is what makes this first 8 p.m. ET appearance worth monitoring.