America's richest men at last have something in common with its poorest voters: they can't agree on who their next president should be.

With less than a week to go before the US election, at least 100 billionaires have backed either Kamala Harris or Donald Trump, according to analysis by Forbes. While most of the country's estimated 813 billionaires have opted to "watch from the sidelines", 83 have publicly endorsed the vice president and 52 the former president.

That's a marked departure from 2016 and even 2020 when few high-profile billionaires publicly associated themselves with Trump. But among the wealthiest men, there is a more even "split", said Fortune. And according to a major Bloomberg analysis, "among the ultra-rich, Trump comes out on top".