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George Soros spoke at the World Economic Forum's annual event in Davos, Switzerland Friday. Above, the billionaire investor was photographed speaking on stage at the Annual Freedom Award Benefit Event hosted by the International Rescue Committee at the Waldorf-Astoria in New York Nov. 6, 2013. Reuters

Billionaire investor George Soros helped kick off the World Economic Forum’s annual meeting in Davos, Switzerland, Friday morning by throwing a damper on another major event across the Atlantic with a shot at fellow billionaire Donald Trump’s presidential inauguration.

Soros, a Hungarian-American businessman famous for his spot-on market predictions, called Trump “a would-be dictator,” said the real estate magnate was “going to fail” and forecasted a grim future for markets.

“I’m convinced that he’s going to fail, not because of people like me who would like him to fail, but because the ideas that guide him are inherently self-contradictory,” Soros told Bloomberg at the event, adding that the contradictions were evident in his picks for close advisers and cabinet members, whose policies far from aligned with his own, let alone each other’s—something Trump appeared to acknowledge in a recent tweet. “You have the various establishments fighting with each other, and that it going to cause a very unpredictable outcome. So right now, uncertainty is at a peak. And uncertainty is the enemy of long-term investments. So I don’t think that markets are going to do very well.”

The investor, whose net worth Forbes estimated to be $24.9 billion, also painted Trump as an autocrat in need of a check by a more unified Congress.

“I have described him as an impostor and a con man and a would-be dictator, but he’s only a would-be dictator, because I am confident that the Constitution and the institutions of America, of the United States are strong enough, the division of power is in operation,” Soros said. “I think Congress will be a bulwark, protecting its rights, and when Trump oversteps the mark, they will fight back. And if they have a bipartisan coalition in limiting him.”

Soros—whose fund gave efforts to elect Trump’s rival, Hillary Clinton, more than $10.5 million in 2016—took aim at another far-right, populist leader, British Prime Minister Theresa May, in his comments at the Davos event.

“It’s unlikely that Prime Minister May is actually going to remain in power,” he told Bloomberg, citing a British cabinet as divided as Trump’s, as well as denial among Britons over the consequences of the country’s impending break from the European Union, more commonly known as “Brexit.”