Hungarian-American Billionaire philanthropist George Soros has launched a stinging attack on the "authoritarian rulers" of both the US and China.He said President Donald Trump was a "conman and the ultimate narcissist" who had breached the limits of the US constitution.
And he said China's President Xi Jinping was using technology to exert total control over Chinese life.
"The world would be a better place if they weren't in power," Mr Soros said.
Using his annual speech at the World Economic Forum (WEF), in Davos of Switzerland, the financier warned of a growing threat from populism and climate change, while pledging $1bn towards a new global university network to tackle intolerance.
But the businessman - who is a major donor to the US Democratic party - said Beijing and Washington posed the biggest threat to "open societies".
The US and China recently struck a deal to de-escalate a major trade war which has seen both sides impose billions of dollars worth of tariffs on each other's exports.