Intensifying troubles at Bank of America Corp. and Citigroup  are spawning new questions about a possible need for further government support, even for the likes of Wells Fargo & Co., which is perceived by many on Wall Street to be in relatively sound shape.

"I wouldn't be surprised at all if Wells Fargo comes back to the government for help," Jack Ablin, the chief investment officer at Bank of Montreal's Harris Private Bank, said in an interview Friday.

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