Briefs filed this week lay out positions, including merchant coalition that banks and card brands would hike interchange while case moves forward.
Latest round in battle between card brands and retailers seeks rejection of interchange settlement.
An increasing number of retailers appear to be coming out in opposition to the recent proposed settlement of the antitrust case centering on credit card interchange.
Walmart says it's disappointed in settlement and some retail associations are advising members to not agree to proposal.
The U.S. Justice Department announced last week that a long-running antitrust investigation against the three largest card brands has ended in a settlement with two of the three and litigation against the third.
Consumer and retail groups are praising the U.S. Department of Justice's actions against major credit card brands, but analysts are split about whether the moves will result in real lower prices for consumers.