Dan Mitchinson: US correspondent on Joe Biden announcing his campaign to run for re-election in 2024 - Heather du Plessis-Allan Drive

Joe Biden has formally announced his campaign for re-election to the White House in 2024.

He's already the oldest president, and would be 86 before ending his second term.

It could mean a second Biden v Trump election, a prospect supported by only 5 percent of Americans.

US correspondent Dan Mitchinson says many voters would like a new face in the presidential race.

"Nobody wants this to happen again, I think everybody's just tired. They want some new blood into this again, they don't want a repeat of what we just went through a few years ago."

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