Updated from 12:40 p.m. EDTCitigroup ( C) said Wachovia ( WB) would have failed last Tuesday if Citi had not heeded the federal government's request to step in and buy much of the ailing bank. The New York bank made the claim Monday in a statement announcing it had filed a $60 billion lawsuit against Wachovia and Wells Fargo ( WFC) for breaching an exclusivity agreement by trumping its $2.16 billion deal struck Monday with a $15.1 billion agreement reached Friday. Citi said Wells Fargo "walked away" from a deal before federal authorities called on Citi to help. Citi's purchase was contingent on help from the Federal Deposit Insurance Corp. Citi was assuming responsibility for up to $42 billion of losses on $312 billion of Wachovia loans identified as potentially troubling. The FDIC would backstop the rest. Citi also was not buying Wachovia's securities and asset management units. Wells Fargo's offer was for the full company and included no help from the federal government. "This was always a deal Citi wanted rather than one we needed," Citi said in a statement announcing the lawsuit. "We were and remain very excited about this transaction and how it will benefit the clients and shareholders of Citi and Wachovia, as well as help preserve the stability of the financial system. The Citi/Wachovia transaction would have been signed and announced on Friday, Oct. 3 if it had not been subverted by the unlawful conduct of Wachovia, Wells Fargo, and their officers and directors and outside advisors." Citi reiterated that it had been providing liquidity support to Wachovia since its deal was announced.