Letterman also too the opportunity to take a shot at President Trump.
David Letterman admitted he overstayed his welcome -- by 10 years -- on late-night television.
The 71-year-old made the revelation during an appearance Thursday on Ellen DeGeneres' talk show. Letterman quit in network TV in 2015 after 33 years as a late-night host on CBS and NBC, and is beginning his second season on his more leisurely-paced Netflix show.
"Here's the mistake I made. I stayed on television way too long," Letterman told DeGeneres to which she replied, "That's not true."
"Yes, it is true," Letterman responded. "It turns out nobody had the guts to fire me.