The letter caused buzz during the annual World Economic Forum in Davos, Switzerland. CNBC has confirmed its contents.

"It can't be business as usual amid constant protests, riots, shutdowns and escalating social tensions," Klarman wrote in the annual letter to investors, according to a New York Times column filed by CNBC " Squawk Box " co-anchor Andrew Ross Sorkin .

Seth Klarman, a hedge fund billionaire some call the next Warren Buffett, wrote a sobering letter warning his investors of the economic impact of global tension, rising debt and the pervasive political divide.

Seth Klarman, chief executive officer of The Baupost Group LLC, listens during an interview in New York, June 8, 2018.

In the letter, Klarman expressed confusion at investors' reaction to the U.S. retreat from international leadership and President Donald Trump's Twitter outbursts. Trump scrapped plans to attend Davos due to the government shutdown, which is in its 32nd day with no clear end in sight.

"As the post-World War II international order continued to erode, the markets ignored the longer-term implications of a more isolated America, a world increasingly adrift and global leadership up for grabs," he wrote.

Klarman also warned about growing debt levels, pointing out that total U.S. government debt now exceeds GDP, a level that other countries like Canada, France, Britain and Spain are approaching.

"The seeds of the next major financial crisis (or the one after that) may well be found in today's sovereign debt levels," he said.

Klarman runs Baupost Group, which manages $27 billion and counts some of the world's wealthiest families as investors, according to the Times.

Read the full report in The New York Times.

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