More problems for Citigroup?

Bloomberg reports Citigroup still faces major challenges despite the aid the company is receiving from the government. Meredith Whitney of Oppenheimer & Co. says Citi "faces further credit losses and share dilution." Whitney has an "underperform" rating on the stock, citing Citi's $120 billion in risky assets as a main concern and potential future source of more woes. 

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