Joe Biden shows no sign of stepping aside as the Democratic Party nominee in the US presidential race.

But he is under pressure to show he has the physical and mental capacity to defeat Republican nominee Donald Trump and serve another term as president.

With other potential Democrat replacements staying quiet, it leaves Vice-President Kamala Harris as the most likely to step in if Biden steps aside.

So, who is Kamala Harris and could she beat Trump? 

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Julia Manchester, national political reporter with The Hill