amy javers has the story. >> please stand and raise your right hand. >> reporter: it was a day for target to face the music on capitol hill in the wake of a massive data breach that affected up to 70 million americans. >> to begin, i want to say how deeply sorry we are. >> reporter: and target wasn't alone. a neiman marcus executive explained his company was stunned to find itself the victim of an extremely sophisticated cyber attack on 77 of its 85 stores. >> we have never before been subjected to any sort of significant cyber security intrusion. >> we all want to stop these attacks. >> reporter: one senate bill would set a standard for companies to disclose data breaches and require companies to protect consumer databases. >> this is a crime that happens daily. >> reporter: now there's a new fight between retailers whose data is being stolen and the banks incurring the costs of reimbursing consumers and replacing hacked cards. the bankers made their frustration clear in a separate hearing this week. >> we're going to make sure that customers are made whole and have zero liability. who's