White House press secretary Jen Psaki said Monday that President Joe Biden remains confident that 88-year-old Democratic Sen. Dianne Feinstein can do her job.  

'Yes, she's a longtime friend, a proud public servant, and someone he has long enjoyed serving with and working with,' Psaki told DailyMail.com at the press briefing.  

Feinstein, one of the longest-serving senators, had long been renowned in Washington for an issue-focused passion and quick wit, but now people who have worked with the California lawmaker for years say she has difficulty recognizing them and repeats the same few talking points. 

On Thursdsay, Feinstein said she wouldn't step down from her position before it ends in 2024, despite democratic colleagues saying they're concerned she's 'mentally unfit to serve.' 

Feinstein, 88, said she 'regularly' meets with leaders and isn't 'isolated,' after four senators - three of them Democrats - a California Congress member, and three former staffers said that her short-term memory is deteriorating. 

'I see people. My attendance is good. I put in the hours. We represent a huge state. And so I'm rather puzzled by all of this,' she told the San Francisco Chronicle.  

The senator said no one had brought up these concerns to her directly. 

'No, that conversation has not happened,' she told the Chronicle. 'The real conversation is whether I'm an effective representative for 40 million people.'