Analysis of the wealth of America’s richest people found that Gates, Bezos and Buffett were sitting on a combined $248.5bn (£190bn) fortune. The Institute for Policy Studies said the growing gap between rich and poor had created a “moral crisis”.

In a report, the Billionaire Bonanza, the thinktank said Donald Trump’s tax change proposals would “exacerbate existing wealth disparities” as 80% of tax benefits would end up going to the wealthiest 1% of households.

“Wealth inequality is on the rise,” said Chuck Collins, an economist and co-author of the report. “Now is the time for actions that reduce inequality, not tax cuts for the very wealthy.”