Interwebz rumor. Take with salt grains:

GLP rumor: ******* works at the White House They have a source....
...
Word is Joe is now worried for his life.
.... He knows he's been deeply betrayed by countless friends and colleagues but HE is the president, they're not. He knows they want him out, he knows they won't take "no" for an answer. This is going to play out in a way that's historic in modern times. I'm not a Biden fan but I empathize with the betrayal he's going through, it's astonishing and unprecedented to see a party turn on their leader like this. By the way, he does have onset dementia but he's still very alert and himself a good portion of the day, he knows what's going on.

Edited to limit dox.