U.S. card data is low-hanging fruit for data thieves.
Georgia Democrat Hank Johnson said he would support an "oversight investigatory hearing to probe into that matter."
Massive hack could expose business services members at credit unions.
NAFCU renews call for congressional action while New York attorney general says probe is underway.
Trade group urges Congress to impose stricter rules, spread financial responsibility to retailers.
Trade group to open website next week to allow credit unions to report expenses they incur from massive hack.
State's credit union network reports activity by phone calls, emails and in-person contacts.
Trade groups call for tighter security, while credit unions monitor and warn.
Long-standard encryption now seen as vulnerable, but experts say turn off the compression to lower the threat pressure.
“The American people have a right to know ...," panel chair tells bureau deputy director.