Can Biden be replaced as Democrat presidential candidate?

​​Reports suggest that some Democrat politicians and operatives expressed their hopes that the 81-year-old Biden would step aside, with some even considering going to the White House to publicly voice their concerns about his candidacy.

source https://timesofindia.indiatimes.com/world/us/presidential-debate-fallout-can-joe-biden-be-replaced-as-democrat-candidate/articleshow/111348391.cms