“Your debate team should’ve used this dosage on debate night,” senior adviser Jason Miller wrote on X in response to a Biden post.
Trump repeatedly claimed his opponents were on performance enhancing drugs ahead of debates in 2016 and 2020.
Biden also reminded those seeking an alternative that he has not only defeated the former president, he also won the majority of party delegates in the Democratic primaries earlier this year.
This effectively means that to have a new candidate Biden would need to voluntarily stand down so the party can either rally around a replacement or have an open convention to choose one.
“Some folks don’t seem to care who you voted for,” he told supporters as they chanted “Let’s go Joe!”
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“Well guess what? They’re trying to push me out of the race. Let me say this as clearly as I can. I’m staying in the race!”
Trump, meanwhile, has kept a relatively low profile this week, allowing the scrutiny to remain on Biden, whom he said had “choked like a dog” during last week’s 90-minute verbal sparring match together.
In a post on social media, the 78-year-old Republican challenged Biden to a second presidential debate, but suggested it should be a “no holds barred” contest with no moderators.
In a new court filing on Friday (Saturday AEST) his lawyers also asked the judge overseeing his classified documents trial to freeze the case following the Supreme Court’s immunity decision this week.
Biden has been under growing pressure to stand down ever since last week, when he failed dismally to persuade voters he is mentally and physically capable of another four years in the White House.
Despite only being three years older than Trump – and despite Trump also having his fair share of public gaffs – Biden’s age has been a major worry for the vast majority of Americans, including many Democrats.
Thursday’s debate, in which he struggled to string sentences together and often looked confused – merely exacerbated these concerns.
The Wisconsin speech sought to shift the focus back onto Trump by painting the Republican as a liar, a threat to democracy, and a “one-man crime wave”.
Biden appeared animated and passionate in his remarks, although his speech only lasted about 15 minutes and was aided with the help of a Teleprompter.
He did, however, tackle the issue of his age head on, telling supporters: “I keep seeing old stories about being too old. I wasn’t too old to create over 15 million new jobs. I wasn’t too old to put the first black woman on the Supreme Court of the United States of America, to sign the Respect for Marriage act, or to sign the most significant gun safety laws in 30 years.”
“ So let’s stand together, win this election and exile Donald Trump politically.”