For a $15.1 billion all-stock deal left on the nightstand, Wachovia allowed Wells Fargo Bank to buy it this morning. But not so fast, says Citigroup, who "now demands that Wachovia abide by the terms of its earlier deal to buy Wachovia's banking operations." That is to say, Citigroup would've snatched it up with the help of FDIC; and, like, Wachovia totally promised Citigroup could have it before WFB came along. (SFGate, via AP)