Former Citigroup co-chairman John Reed approached Discover card executives last year with a plan to "get together and jointly buy MasterCard," David Nelms, president and chief operating officer of Discover Financial Services Inc., said in trial testimony Friday.

Mr. Nelms, a witness for the Justice Department in its antitrust case against Visa and MasterCard, said he met at least twice with Mr. Reed in 1999 to pursue this plan, and that it had not been the first time that Citi and Discover had discussed possible collaborations.

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