Another Democratic lawmaker has weighed in on President Biden's mental fortitude and whether he is capable of holding office for a second term.

Rep. James Clyburn, D-S.C., admitted to NBC in a Friday interview that Biden is not the same person as he was four years ago, but asserted that he is still "mentally" fit with one of the "best minds" he's ever worked with.

"You’re traveling with him next week, you’ve spent more time with the president than just about anybody else in the House, is this the same Joe Biden that we saw two years ago?" interviewer Craig Melvin asked Clyburn, who had endorsed Biden in the 2020 presidential race. 

DEFIANT BIDEN SAYS HE'S 'DETERMINED ON RUNNING,' AS NEW POLL AFTER PRESSER SHOWS SLIGHT LEAD OVER TRUMP

"Well, look, I grew up in..." Clyburn started to say before he was asked again, "Is it the same Joe Biden?" 

"No," Clyburn said emphatically, adding that, "I’m not the same Jim Clyburn that I was four years ago." 

Clyburn later said he doesn’t think Biden, physically, is the same as he was during the last presidential election cycle. 

TOP DEMOCRAT ON THE HOUSE INTEL COMMITTEE RESPONDS TO BIDEN'S PRESS CONFERENCE

"Mentally, I do think so," Clyburn declared. "He is still grasping what this country is all about." 

"He has one of the best minds that I have ever been around. The people who've been around him will tell you that, and so I would hope that we will focus on the substance of this man, rather than these sometimes, misspoken words and phrases, and how he has run this country."

Biden faced a wave of mockery online Thursday after he introduced Ukrainian President Volodymyr Zelenskyy as "President Putin" ahead of his press conference.

PELOSI IS WORKING TO UNDERMINE BIDEN'S ATTEMPT TO END DISCUSSION OF HIS CANDIDACY: REPORT

During the conference, Biden also referred to his Republican opponent, former President Donald Trump, as his vice-president.

CLICK HERE TO GET THE FOX NEWS APP

Biden was peppered with questions from reporters who pressed him on whether he would step aside amid mounting pressure from members within his own party following his disastrous debate performance last month.

The president dismissed the notion he's "slowing down" and insisted he was "determined on running" in this year's election.

Fox News Digital's Greg Norman and Brooke Singman contributed to this report. 

Get the latest updates from the 2024 campaign trail, exclusive interviews and more at our Fox News Digital election hub.