Citigroup may soon become the last big Wall Street bank to return bailout funds to the government. The bank's executives plan to announce their program to pay back billions in TARP funds as early as Monday, after negotiating with senior government officials. As of now, bank officials plan to raise approximately $18 billion by selling stock this week, which will contribute to the $136 billion already returned by bailed-out banks. This big-ticket payback comes just in time for President Obama's meeting with chiefs of the nation's biggest banks on Monday, where he will encourage the banks to help speed up economic recovery by providing more loans to homeowners and small banks. “We have to get them off the sidelines and get them to play a more active role in our economic recovery,” said the White House chief of staff Rahm Emanuel.