From "Remarks by President Biden at a Campaign Reception," New York, N.Y., February 7, 2024:
There is only one existential threat we face in this world, and that's the environment. I mean, it literally is the existential threat. It's even more consequential than nuclear power, nuclear war. That would be horrible and awful and it would just make the environment incredibly worse. But it's about the environment.
Later on, in the same remarks, the president returned to the idea of an "existential threat":
I'll end by saying there is one existential threat, and it's Donald Trump. It's not about me; it's about Trump.
So Biden is sure there is "only one existential threat," he just can't quite make up his mind about whether it is "the environment" or "Donald Trump."
One thing Biden sure seems not at all confused about is when he expresses the wish that, "It's not about me; it's about Trump."