Two dozen Republican attorneys general are urging Visa, MasterCard, and American Express to drop their plans to adopt a new merchant category code for gun retailers, saying the move would infringe on consumers' privacy. In a letter sent to the companies Tuesday, the attorneys general warn the credit card companies that they could face legal action if they move forward with the code adopted by the International Organization for Standardization (ISO). On Saturday, Senate Republicans sent a similar letter to the three credit card companies. The letters come after the credit card companies announced plans to start applying the new sales code to transactions made at gun stores. "A fundamental principle for Visa is protecting all legal commerce throughout our network and around the world and upholding the privacy of cardholders who choose to use Visa," Visa said in a statement last week.

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