Responding to the Office of the Comptroller of the Currency’s issuance of federal preemption regulations, Fitch Ratings will rate securitization pools containing residential mortgage loans originated by national banks and their operating subsidiaries without requiring any additional credit enhancements, beginning Feb. 12. The rating agency said it is aware that some jurisdictions may seek to challenge the OCC and the Office of Thrift Supervision on preemption and will monitor those actions accordingly.