Senator Marshall outlined efforts to reduce reliance on foreign fertilizer supply by boosting domestic production, adding key minerals to the critical list, and protecting farmers’ access to essential crop protection tools.
Add key minerals to the critical list.
Occurrences
Evidence
USGS says the 2022 final list of 50 critical minerals removed potash and did not include phosphate, even as Senator Marshall later pushed to add both.
Marshall introduced S.5128, which would direct Interior to designate potash and phosphates as critical minerals and evaluate other fertilizer-related minerals.
USGS says the final 2025 list adds phosphate and potash to the Critical Minerals List.
Assessments
The promised outcome was to add key minerals to the federal critical minerals list. The evidence shows that phosphate and potash, the minerals Marshall specifically sought to add through S.5128, were included on the final 2025 Critical Minerals List. Marshall also made a concrete legislative push for this outcome while serving in federal office. Because the official addition occurred while he remained a U.S. Senator in the same Senate term, this counts as delivered with same_term timing, not merely partial credit.