CHICAGO - Former Citigroup Inc. executive William I. Campbell has been approached by Bank One Corp. president and chief executive officer James Dimon to do consulting work for Bank One.Bank One spokesman Thomas Kelly said Mr. Dimon and Mr. Campbell have been talking but that there is no formal relationship yet.

Mr. Dimon was president of Citigroup until his ouster in fall 1998, the year Citicorp and Travelers Group merged to form Citigroup. Mr. Campbell resigned late last year as executive vice president and co-head of Citigroup's global consumer banking operations.

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