AAU, APLU, AAMC, and COGR submitted joint comments to the EPA opposing the agency's proposed rule Strengthening Transparency in Regulatory Science and notice of supplemental information (SNPRM). The proposed rule and supplemental would restrict the science EPA considers in rulemaking to studies in which the underlying data is made publicly available for independent re-analysis. The letter reiterates concerns from AAU's comments in 2018 that the rule would limit the agency's use of the best available science.