Latest high-profile name to call on president to step aside is Sherrod Brown, the embattled senator from Ohio

Democrats were caught in an apparent stalemate on Saturday as a dug-in Joe Biden continued to endure high-profile calls to end his re-election campaign after a week of astonishing party moves to unseat the president in favor of a candidate many hope will be more likely to beat Donald Trump.

In the weeks since his disastrous debate performance against Trump, the 81-year-old Biden has attempted to fight off calls for him to step down from the top of the ticket amid concerns that his age and mental acuity are no longer up to the job. But a series of interviews, a press conference and speeches have done little to quell party nerves.