Fresh on the heels of public outrage over AIG retention payments and Merrill Lynch bonuses, Citigroup is set to be the next financial behemoth to take the heat. The financial services giant, which will soon be partially owned by the U.S. government, has been asking for Treasury Department approval to pay out special bonuses to employees, reports the Wall Street Journal. The request comes as Citigroup is grappling with broad government pay restrictions that could break apart its legendary energy-trading unit.