Eighty-three American billionaires are supporting Kamala Harris, whereas 52 are backing Donald Trump in the US Presidential elections, as per Forbes analysis. World's richest person Elon Musk has come out in support of Trump. Meanwhile, 28 billionaires have donated $1 million or more to groups backing Harris and 36 billionaires have contributed between $50,000 and $999,999, Forbes data showed.