In accordance with the Agricultural Bioterrorism Protection Act of 2002, we are proposing to amend and republish the select agent and toxin lists that have the potential to pose a severe threat to animal or plant health, or to animal or plant products. The Act requires the biennial review and republication of the list of select agents and toxins and the revision of the list as necessary. This action would implement findings of biennial review of the lists. In addition, we are proposing to codify operational procedures and policies necessary to enforce the regulations. On April 8, 2022, APHIS sent tribal nations a letter outlining the provisions of the proposed rule and soliciting their feedback. On May 5, 2022, the Sac and Fox Tribe of the Mississippi in Iowa submitted a response expressing concerns regarding whether possible Brucella abortus delisting would materially adversely impact APHIS' domestic quarantine program for the control and eradication of brucellosis in cattle and bison. In response, APHIS clarified that the two issues were distinct, and no adverse operational impacts were anticipated. On June 6, 2022, the Tribe indicated that they had no further comments or concerns.