Mr Biden is the President-elect and looks set to become the oldest US President in history following his defeat of Donald Trump in the 2020 election. However, political commentator Iain Dale told Express.co.uk the process of replacing Mr Biden could result in “another national trauma” for America.
Mr Dale said: “It is quite clear to anybody who looks at Joe Biden and compares him to the Joe Biden of 10 0r 20 years ago that there is a decline there.
“Obviously, if he died in office it would be automatic that Kamala Harris would take over.
“But what if his mental powers declined so much that she had to take over?
“There are arrangements in the US constitution for this to happen but after the trauma of the Trump years for that to happen America would go through another national trauma.
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“I think in this country we do not quite get the importance the Americans give to the Presidency.
“There is a reverence for the office that we do not have for the office of Prime Minister.
“It would be a great constitutional issue as to how that would be brought into effect.”
The political commentator added Mr Biden will have an advantage as US President but he is not the leader that America needs.
“I do not think he is the leader that is needed for America at the moment.”
The political commentator added: “He does not strike me as somebody who is a decision-maker.”
“I do not see him providing leadership.
“I do think it is highly likely that Kamala Harris could take over as President at some point during a Biden Presidency.”