Concerns about President Biden's age and fitness for office have been raised by prominent Democrats like Reps. Adam Schiff, Nancy Pelosi, and Sen. Bernie Sanders following his lackluster debate performance against Donald Trump. Schiff and Pelosi emphasized the importance of Biden's ability to defeat Trump for the sake of democracy, with Pelosi suggesting a cognitive test for Biden. Sanders urged Biden to focus on policy issues appealing to working-class voters to secure victory. While some Democrats have called for Biden to step aside, others like Sanders believe he can still win by addressing critical policy concerns.