It comes just days after Biden's debate with former US president Donald Trump, which was marked by verbal gaffes and confusing statements.
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Joe Biden's argument that his disastrous debate performance last week was a one-off is seemingly falling apart.
In his latest verbal slip-up, the president seemingly said he is "proud" to be the first "black woman to serve with a black president."
The 81-year-old president got his words mixed up during an interview with Philadelphia's Wurd radio station when referring to his vice president, Kamala Harris.
"By the way, I'm proud to be, as I said, the first vice-president, first black woman…to serve with a black president," he said.
Earlier in the interview, Biden correctly spoke about how he was the first president to have a black woman as vice president. He also discussed how he appointed Justice Ketanji Brown Jackson, the first black woman to the Supreme Court.
It comes just days after Biden's debate with former US president Donald Trump, which was marked by verbal gaffes and confusing statements.
Biden is now facing increasing pressure to drop out of the presidential race. A Reuters/Ipsos poll showed one in three Democrats favored Biden quitting.
The Biden camp has offered multiple explanations for the president's slurred words, nonsensical phrases, and vacant stares, including jet lag, a cold, and incompetent aides.
But donors have publicly voiced their concerns with what they say are Biden's age-related problems.
On Thursday, millionaire heiress Abigail Disney announced that she would stop donations to the Democratic Party until they "pulled Biden from the top of the ticket".
Her statements echoed that of Netflix cofounder Reed Hastings, who told The New York Times that "Biden needs to step aside to allow a vigorous Democratic leader to beat Trump and keep us safe and prosperous."
Biden has admitted to supporters he does not speak as "smoothly" or "debate as well" as he used to, but has publicly vowed to fight on.
Axios, citing people close to the president, said Biden worked best between 10 a.m. and 4 p.m. and struggled to function outside of that window.
His press secretary, Karine Jean-Pierre, admitted to reporters that "he's a little slower than he used to be."
Biden told the governors he needs to get more sleep and stop holding events after 8 p.m., according to CNN and The New York Times.
Biden's campaign didn't immediately respond to a request for comment from Business Insider about the reports.
On Friday, Biden's mental acuity will be scrutinized when he sits for an interview with ABC News's George Stephanopoulos, who used to be head of communications at the White House during Bill Clinton's presidency.
Biden's previous interactions with Stephanopolous include a rare sit-down appearance in 2021, where he defended the US decision to pull its troops from Afghanistan.
