Biden ended his unscripted q and a portion of his news conference, which lasted 50 minutes, taking a question about a Truth Social post made by Trump during the press conference.

The former president mocked Biden's age and memory for a gaffe early on where he said Vice President Trump instead of Harris.

When asked how he would combat that criticism, Biden smiled and said "Listen to him," before walking off the stage.

Later, Biden's campaign posted a screenshot of Trump's post on X and with the statement "By the way: Yes, I know the difference. One’s a prosecutor, and the other’s a felon."

Toward the end of the presser, when asked if he would reconsider staying in the race if his team showed him data that showed Vice President Kamala Harris would fare better against Trump, Biden said: "No, unless they came back and said, There is no way you could win."

He continued in a whisper, "No one’s saying that. No poll says that."

"I think I am the best qualified to win," Biden said as his news conference neared an end. "But there are other people who could beat Trump, too."

"But it would be hard to start from scratch," he quickly added. "We talk about money raised. We are not doing bad. We've got about $220 million in the bank. We are doing well."

Asked if he is going to take a cognitive test before the election amid questions about his mental fitness in the wake of the debate, Biden said that if his doctor told him he needed to, he would.

Biden said he has taken three "significant" neurological exams during his presidency, most recently in February.

"They say I am in good shape," he said, reiterating that he is tested "every single day" on his neurological capacity in his job.

The president added, "No matter what I did, not everyone is going to be satisfied."