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Billionaire Clinton supporter says Trump is 'not a good investment'

Trump's 'not a good investment': Simons

James Simons, a major donor for the Democratic party and its presumptive nominee Hillary Clinton, told CNBC's "Squawk on the Street " that if you compare the presidential candidates using the Sharpe ratio, presumptive GOP nominee Donald Trump is "not a good investment."

The Sharpe ratio is a way of measuring average return while accounting for risk or volatility.

"Now even if those two candidates had the same expected return — which I doubt — but even if Trump's was as good as Hillary's, his volatility is so enormous that his Sharpe ratio is terrible," Simons said.

"So as an investment, Trump is not a good investment, no matter what you might think of his potential return. He's just a wild man," he said.

Simons said that he is a supporter of Clinton, who he said would "make a fine president." When asked what a Trump presidency would mean for the U.S. outlook, Simons said "it wouldn't be good for the country."

"I can't tell what the man will do because he's so erratic. As a businessman, he was apparently pretty sleazy. I just can't predict and maybe it would turn out OK, who knows," he concluded.

Hope Hicks, a spokeswoman for Trump, did not immediately respond to CNBC's request for comment.