Billionaire Julian Robertson, founder of Tiger Management LLC, thinks the U.S. market is overheated and sees a "very serious credit bubble."

He told CNBC that near-zero interest rates on savings accounts are forcing people into stocks.

"As yields go up, that will be heightened by people coming out of stocks and going into where they belong in the first place: bonds."

Meanwhile, Robertson said he is "very positive" on Apple and said Google and Netflix are the "greatest value stocks around."

As for politics, Robertson said he would like to see former Florida Gov. Jeb Bush become the next president.

"I think it is very important that we have a manager in here that has managed a state or managed something and managed well," he said, calling Bush a "very smart guy."

"We have a brilliant, attractive guy in there now but as a manager and leader I think he's pathetic."

Turning to global matters, Robertson doesn't think Greece alone is terribly important and doesn't think it will trigger another global financial crisis.

But if Greece does exit the euro zone, there could be a ripple effect in Europe.

"If Greece goes, Spain — which really has a serious problem with individual debt throughout the country — Spain could have problems and they could be tempted to leave, too. And then perhaps Italy. That would be serious," he said.

Robertson is the just the latest in a choir of noted economic experts seeing storm clouds in the US financial horizon.

International investor Jim Rogers, chairman of Rogers Holdings, has warned that the U.S. stock market is headed for a major tumble, as the Federal Reserve begins to curtail its massive easing program.

"This is the first time in recorded history that all the major world’s central banks are printing staggering amounts of money," Rogers told MarketWatch.

"Now the world has this huge artificial ocean of liquidity. The people getting the money are having a wonderful time. But when it ends, it will be very nasty. The idea that the solution to too much debt is more debt is mind-boggling."

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