washington two key u.s. senators monday ask equifax inc efx.n answer detail question breach information affect 143 million americans include whether u.s. government agency record compromise hack senator orrin hatch chair finance committee rank democrat ron wyden also demand equifax chief executive rick smith provide timeline breach discovery ask information authorities company board notify three executives sell stock company august first tell data breach equifax immediately respond request comment letter come amid mount scrutiny company response breach lawmakers regulators security experts prompt credit-monitoring service issue apology friday pledge dedicate resources help affect consumers scope scale breach appear make one large record sensitivity information compromise may make costly taxpayers consumers letter say equifax announce last week learn july 29 hackers infiltrate systems mid-may pilfer name birthdays address social security driver license number cyber security experts say among large data hack ever record particularly trouble due richness information expose three days equifax discover breach three top equifax executives include chief financial officer john gamble president unit sell equifax share exercise options dispose stock worth 1.8 million regulatory file show equifax say statement last week executives aware intrusion occur sell share hatch wyden ask smith respond sept. 28. congressional committees announce plan hold hear investigate equifax breach want answer senators want know equifax chief information security officer past two years many time equifax employ third-party cyber security experts conduct penetration test internal external systems senators want copy equifax penetration test audit report outside cyber security firm separately group 20 democratic senators ask equifax end use force arbitration agreements limit ability consumers pursue claim lobby reverse new rule consumer financial protection bureau limit use force arbitration financial service sector key u.s. senators demand answer equifax hack