It brought enforcement actions against Equifax and TransUnion earlier this year for misstating the cost and usefulness of the scores they provide, but it does not intensively monitor the companies. In her letter to the CFPB, which is under attack by Republicans who believe it is already too powerful, Warren asked if the agency has 'adequate statutory authority to regulate credit reporting agencies and protect consumers" and solicited the CFPB's feedback on what other powers it might require to better regulate them. At least three bills were introduced on Thursday in response to the hack. Four Democratic senators, including Ed Markey of Massachusetts, sponsored legislation that would require Equifax and other data brokers be held accountable for errors. (Reporting by Chris Sanders; Additional reporting by Michelle Price; Editing by Paul Tait)