On Friday, he shocked viewers saying it was the "end of an era."
The anchor announced the news Friday night.
The news host and his fiance, Tim Malone, want to get married first.
"I've heard a lot of pathetic things from this White House; this one really takes the cake," he said.
"You will go down in history as the worst of the worst and some day in the future, that will be all anyone remembers of you: that you were awful, terrible, the worst President, and that you won by an electoral fluke,"
Mounting evidence shows a drug Trump said would not 'hurt people' is leading to a higher percentage of deaths.
CNN is standing by their anchor.