Democrats question Biden's mental fitness after weeks of cringe-worthy gaffes

However, Minnesota’s Dean Phillips is reportedly weighing up a bid and sought advice from strategists about running against the Commander-in-Chief.

The American electorate is becoming increasingly concerned with Biden’s mental capability, with a majority of voters expressing fears about his age.

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Representative Hillary Scholten claimed Biden could benefit from a challenge in the Democratic Party primary as it would force him to demonstrate his fitness.

Scholten, who represents a historically Republican slice of Western Michigan, told Politico: “Only positive things could come from an open and competitive primary in the presidential election.

“It is a detriment to all of us if we are ignoring the concerns of the public around the president’s image.”

Democrats, she said, should “get more people out there, what are we afraid of? It’s problematic that we’re ignoring it. It makes us look out of touch, it makes us look afraid.”

Speculation about Phillips challenging Biden comes after Robert F Kennedy Junior dropped out of the Democratic race to launch an independent campaign.

The decision could have profound ramifications ahead of 2024, with Kennedy attracting support from Covid-sceptic Americans who often flock to former President Donald Trump.

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However, the 77-year-old property-tycoon-turned-politician is currently showing his mettle in the Grand Old Party’s primary race.

Trump, who is hoping to become just the second President to serve non-consecutive terms in the Oval Office, is facing attacks from a dozen Republican rivals.

The crowded primary, which comes amid several legal challenges, could battle-harden Trump ahead of a potential rematch with Biden in 2024.

Biden is instead facing mounting pressure about his age.

Democratic lawmakers recently reportedly watched livestreams of focus groups with voters in the swing states of Nevada and Michigan.

Respondents expressed growing concern about the President’s age.

Montana Democrat Jon Tester said: “I think you got to be as public as you possibly can in addressing issues, and that’s how you can settle it.

“But it’s not going to be easy because he is [going to be] 82 years old.”

New Hampshire Senator Jeanne Shaheen added: “I think it’s important to confront it.”

It has been suggested Biden could emulate Ronald Reagan’s quips on the 1984 campaign trail.

Reagan, aged 73 at the time, was facing former Vice President Walter Mondale, 56, in the race for the White House.

The actor-turned-politician’s landslide victory was littered with jokes, with Reagan taking aim at his opponent’s “youth and inexperience” in a key debate.

Longtime Democrat strategist Paul Begala said: “Reagan didn’t go to Georgetown and give an hourlong address about the issue.”

However, other figures from inside the Democratic Party believe Biden owes the electorate more than humour.

Current opinion polls indicate Biden will likely romp to victory against his Democrat challenges.

But surveys on a potential rematch against Trump provide a far more mixed picture.

Biden leads Trump by one point in Fox News' latest poll.

However, Trump defeated former First Lady Hillary Clinton in 2016 through the electoral college system despite trailing by 2.1 per cent in the popular vote.

A one-point margin could enable the 45th President to win back Arizona, Georgia, Michigan, Pennsylvania and Wisconsin.