In his first television interview since the debate, President Biden tried to reassure supporters, but he spent much of the interview resisting questions about his capabilities.
Donald Trump is ahead of President Biden by six percentage points among likely voters in a new national survey. Overall, 74 percent of voters view Mr. Biden as too old for the job, an uptick since the debate.
Earlier moves by donors to mount campaigns to pressure President Biden to step aside have either fizzled out or prompted pushback from fellow contributors and operatives.
Leading Democrats have lent legitimacy to questions about the president’s mental acuity, and made clear that the matter of his stepping aside is far from settled.
Around Mr. Biden, a siege mentality has set in post-debate, one at odds with the persistent concerns of voters who view him as too old to be effective.