After Wells Fargo announced last week that it was set to buy Wachovia for $15.1 billion, Citigroup has now objected, demanding that it be called off, saying the new deal has breached its exclusive acquisition rights. ┬á The Wells Fargo deal had trumped an earlier government-backed rescue deal that Citigroup had proposed, in which it would buy WachoviaÔÇÖs banking operations for $2.2 billion. ┬á Wells offered to buy all of Wachovia for more money without government aid, to which Wachovia had decided not to honor its prior agreement with Citigroup.