In a court filing, the Department of Justice has revealed the degree to which it is relying on private litigation against Visa U.S.A. and MasterCard International to support its own case against the two bank-owned associations.

Several months ago, the government won the right to obtain the discovery documents in what is known as the Wal-Mart lawsuit-a class action filed by major retailers against Visa and MasterCard, attacking their debit card rules.

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