Robert F Kennedy Jr has pleaded with the First Lady to ask President Biden to step down.
The independent presidential candidate was speaking as a special counsel's report found him to be an "elderly man with poor memory."
Speaking on Jesse Watters Primetime on Fox News, RFK Jr said if he were in Biden's position, he would hope someone in his own family would politely suggest he step away from the political limelight.
It comes after President Biden made several gaffes mixing up world leaders including Angela Merkel and Emmanuel Macron.
RFK has hit out at the President over his mental capabilities
Reuters
He said: "I think anybody can make up their mind about [Biden's situation] as well as I can. I hope that if he has the kind of cognitive challenges that the special counsel indicated he has, and if I were in that position, a member of my family or staff would approach me and assist me in gently stepping down."
When asked if that should be the role that Jill Biden plays, he said: "Yeah...I think she should."
"[He needs to] tell us what he's going to do about closing the border. Tell us … what he's going to do about restoring the middle class, about ending the… forever-wars around the world, about unravelling corporate capture and all these issues that are critical to our country right now."
"We need a president who is on the ball, somebody who we all trust to answer that phone call at 3:00 in the morning."
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The issue of mental competency has become a major topic in this year's presidential campaign. Biden, 81, and likely candidate Donald Trump, 77, are the two oldest men respectively to have been elected president.
The issue is a vexing one for Biden's re-election campaign. In a Reuters/Ipsos poll conducted in September, 77 per cent of respondents said they agreed with a statement that Biden was too old to work in government, while 56 per cent said the same of Trump.
Biden angrily denied allegations about his memory, saying in a White House appearance on Thursday night, "my memory's fine."
TJ Ducklo, a Biden spokesman, said in a statement released by Biden's re-election campaign: "Every single time Donald Trump opens his mouth, he's confused, deranged, lying, or worse."
Americans are due to go to the election booths in November, with a rematch of the 2020 presidential election the most likely.
The most recent poll, which closed on Monday, showed former President Trump with the support of 37 per cent of respondents, compared with 34 per cent support for Biden, at the edge of the survey's 2.9 percentage point margin of error.
Some 10 per cent said they would vote for other candidates; 12 per cent said they would not vote; and 8 per cent refused to answer the nationwide poll conducted online with responses from 1,237 US adults.
