Why Citigroup Got Detroit's Money

Congress spends two days in deep decision pertaining to Detroit's "desperate" automakers. Not only are their request delayed but now they must also give Congress their strategies for existing as businesses. But why is this when the Treasury Department and the Federal Reserve pledge $20 billion to Citigroup, plus a $25 billion investment they received a month ago. I wonder what Congress' reason is for having more faith in the bank, Citigroup.