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Blankfein spoke at an event hosted by The Wall Street Journal on Wednesday morning, and Journal editor-in-chief Gerard Baker asked him about the real-estate magnate and Republican front-runner.
"I can find fault with some of the things that seem wacky to me that he says," Blankfein said, amid attempting to explain some of the appeal of Trump to a variety of the Republican electorate.
But he added: "It's hard to imagine his finger on the button. That blows my mind."
The 61-year-old executive admitted his own moderate views might be coloring his perception of the real-estate mogul.
"I'm a Democrat, by the way," he said.