Concerns about President Joe Biden's cognitive abilities have intensified following his poor performance in a recent debate against Donald Trump. Jon Stewart has criticized the Democratic Party for downplaying Biden's issues and urged them to consider alternative candidates. Stephen Miller accused Vice President Kamala Harris of covering up Biden's mental decline, arguing she has a constitutional duty to invoke the 25th Amendment. The debate performance has prompted discussions among Democratic senators about Biden's future in the race, with calls for more aggressive campaigning or possible replacement. As the party grapples with these concerns, Trump's confidence in his re-election bid has grown, influencing his considerations for a running mate.