“Bob Newhart: A Legacy of Laughter,” an “Entertainment Tonight” special paying tribute to the comedy icon following his recent death, hit 4.1 million viewers on CBS on Monday. That made it the most-watched program in its 8 p.m. timeslot — surpassing the viewership of “American Ninja Warrior” (2.7 million viewers on NBC), “The Bachelorette” (2.6 […]