The claim that Trump cut cancer research funds because he thought researchers were making mice transgender is misleading; the controversy stems from a misunderstanding between 'transgenic' and 'transgender' mice, and the funding cuts targeted broader scientific research, not specifically due to this misconception.
Trump cut cancer research funds because he thought that they were making mice transgender

Trump Decried Millions Spent 'Making Mice Transgender.' It Was Cancer and Asthma Research
Source: rollingstone.com
Key Evidence
Rolling Stone reports that the $455,000 cited was for HIV researchers studying immune responses in mice given cross-hormone therapy, not making them transgender.
rollingstone.comrollingstone.comTrump Decried Millions Spent 'Making Mice Transgender.' It Was Cancer and Asthma...
The Times of India and NDTV explain the confusion between 'transgenic' (genetically modified) and 'transgender' mice, clarifying that no animals were being made transgender.
timesofindia.indiatimes.comtimesofindia.indiatimes.comDid Donald Trump mistake transgenic mice for 'transgender mice' in his speech? -
ndtv.comndtv.comTransgender vs Transgenic Mice: Row Over Donald Trump's Animal Experiments Claim
The Guardian and PBS News highlight scientists' concerns about funding cuts harming critical research and refute the claim that scientists are making mice transgender.
theguardian.comtheguardian.com‘Impossible to rebuild’: NIH scientists say Trump cuts will imperil life-saving...
pbs.orgpbs.orgFact-checking Trump’s claims during his address to Congress
What the Evidence Shows
The phrase 'making mice transgender' originated from a public statement by President Trump criticizing certain federally funded research projects. However, the scientific term involved is 'transgenic mice,' which are genetically modified mice used in medical research, including cancer and asthma studies.
Several reputable sources clarify that the research in question involved transgenic mice to study hormone treatments relevant to transgender health, not changing the gender identity of mice. This confusion led to misinterpretation and political controversy.
Trump's administration did implement cuts to various scientific research programs, including cancer research funding, but these cuts were part of broader budgetary decisions rather than solely motivated by the misunderstanding about 'transgender mice.'
Experts and scientists have expressed concern that these funding cuts imperil vital life-saving research, emphasizing that the scientific community views the claims about 'making mice transgender' as inaccurate and a mischaracterization of legitimate biomedical research.
Therefore, while Trump did cut cancer research funds during his administration, attributing this action solely to a belief that researchers were making mice transgender is an oversimplification and misrepresentation of the facts.