Once a rival for the top job, the California senator of Indian-Jamaican heritage had long been considered the front-runner for the number two slot.

The former California attorney general has been urging police reform amid nationwide anti-racism protests.

Mr Biden will face President Donald Trump in the election on 3 November.

After Tuesday's announcement, Ms Harris tweeted that Mr Biden "can unify the American people because he's spent his life fighting for us. And as president, he'll build an America that lives up to our ideals.

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