Two key U.S. senators have written to Gregg Steinhafel, chief executive officer of Target Corp, seeking "detailed information" on the hacking of credit and debit cards of millions of customers during the holiday shopping season.

"We ask that Target's information-security officials provide a briefing to committee staff regarding your company's investigation and latest findings," John Rockefeller, chairman of the Senate Commerce Committee, and Claire McCaskill, chair of the Commerce subcommittee on consumer protection, wrote to Steinhafel in a letter dated January 10 and released on Tuesday.

Target's recent incident shows the need for federal legislation on commercial data practices, the senators said.