Rep. Nancy Mace was mocked and fact-checked after claiming taxpayers were funding “trans mice” and promoting a proposed TRANS MICE Act to ban federal funding for such research. A community note on X clarified that “trans mice” normally refers to transgenic mice — genetically modified animals used in biomedical research — not transgender animals. Mace said she meant “federally funded transgender-related experiments,” but fact-checkers noted the cited studies investigate basic biology and diseases like cancer and asthma, not gender-affirming care.
Nancy Mace Mocked and Fact-Checked After Claim About Taxpayer-Funded 'Trans Mice'
Rep. Nancy Mace (R-S.C.) faced a wave of ridicule and fact-checks after posting on X that American taxpayers were funding what she described as “trans mice.” Her post sparked clarifying community notes and a renewed discussion about the distinction between political rhetoric and biomedical research.
What Mace Posted
Mace wrote on X: “Animals should not be used for radical transgender experiments. This is not science. This is ideological cruelty paid for by the American taxpayers.” The post included an image of a mouse reaching toward a gloved hand with the words “NO TRANS MICE.” She promoted proposed legislation she called the TRANS MICE Act, which she said would bar federal funds from being used “to conduct, support, or fund research aimed at altering an animal’s biological sex.” Her statement criticized hormones, surgeries, and taxpayer-funded animal experiments she characterized as “mutilating animals in the name of transgender ideology.”
Community Note and Clarification
Users on X added a community note explaining that the phrase “trans mice” is commonly used as shorthand for transgenic mice — laboratory animals that have had foreign DNA inserted into their genomes to study gene function, disease mechanisms, and treatments (for example, in cancer research). The note emphasized that “transgenic” refers to genetic modification, not gender identity.
Mace responded that her post was not about transgenic mice but rather concerned what she described as “federally funded transgender-related experiments on animals.” She repeated the bill’s full name — Transgender Research on Animals Now Stops and Money for Ideological Cruelty Eliminated Act — and said the community note addressed a different subject.
Reaction and Broader Context
Critics and journalists quickly pointed out the misunderstanding: transgenic mice are widely used research models created by inserting foreign DNA — such as human genes or specific genetic markers — to study disease, immunity, and other biological processes. Many fact-checks referenced similar claims made last year by former President Donald Trump that taxpayers were funding efforts to “make mice transgender.” Fact-checkers found those characterizations misleading, noting the referenced studies were basic biomedical research — for example into asthma and cancer — not investigations of gender-affirming medical treatments.
As PBS reporter Laura Barrón-López wrote in a fact-check, “The idea that scientists are making mice transgender is false,” and the studies cited do not examine gender-affirming care, which remains a recognized medical practice supported by major U.S. medical associations. Other reporters reiterated that the research in question focuses on fundamental biological questions and disease mechanisms rather than social or clinical questions about gender identity.
Key takeaway: The term “trans mice” in scientific contexts normally refers to transgenic mice (genetically modified for research), not animals undergoing treatments related to gender identity; lawmakers’ rhetoric conflating these terms drew swift rebuttals from fact-checkers and scientists.
Original Coverage
The initial report on Mace’s post first appeared on Mediaite and was subsequently referenced by multiple news outlets and fact-checkers responding to the public conversation.
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