While on stage for a National Press Club panel discussion, Koppel attempted to make a point that many media executives admit Trump is good for ratings, as viewers on both sides of the aisle tune in to see the round-the-clock drama unfold.
Stelter responded by asking, "That means what? If ratings are up, that means what?"
Koppel – who anchored ABC News' "Nightline" for 25 years and has been a working journalist for over four decades -- quickly answered.
"The ratings are up, it means you can't do without Donald Trump. You would be lost without Donald Trump," Koppel said as Stelter shook his head in disagreement.
"Ted, you know that's not true," Stelter said.
"CNN's ratings would be in the toilet without Donald Trump," Koppel said as the audience laughed.