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This rulemaking would prohibit States from issuing, renewing, transferring or upgrading a commercial driver´s license (CDL) with a hazardous materials endorsement, unless the Transportation Security Administration (TSA) has first conducted a background check on the applicant and determined the applicant does not pose a security risk warranting denial of the hazardous materials endorsement. FMCSA and TSA simultaneously published interim final rules. FMCSA has published another IFR corresponding to TSA´s extension of compliance date. Since this rulemaking conforms to TSA´s rulemaking, the rulemaking is dependent upon TSA action. This action is considered significant because of substantial public and congressional interest, and national security.