The claim that Trump made cuts to cancer research because he thought they were making mice transgender is misleading; the research involved complex biomedical studies, not simply 'making mice transgender,' and the cuts affected important health research.
Trump made cuts to cancer research because he thought 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 reported that Trump's claim about spending on 'making mice transgender' was false; the actual research was related to cancer and asthma.
rollingstone.comrollingstone.comTrump Decried Millions Spent 'Making Mice Transgender.' It Was Cancer and Asthma...
The Guardian highlighted NIH scientists' concerns that Trump's funding cuts would imperil life-saving research.
theguardian.comtheguardian.com‘Impossible to rebuild’: NIH scientists say Trump cuts will imperil life-saving...
WCPO's fact check found no evidence that government funds were used specifically for 'making mice transgender' studies.
wcpo.comwcpo.comFACT CHECK: Does the U.S. government fund studies aimed at 'making mice...
What the Evidence Shows
President Donald Trump publicly criticized federal spending on what he described as research aimed at 'making mice transgender,' citing an $8 million figure. However, fact-checks and analyses reveal that the referenced studies were not about 'making mice transgender' in a simplistic or ideological sense but involved advanced biomedical research related to human health issues such as cancer, asthma, and other diseases.
The research projects targeted by funding cuts included studies on cancer biology, women's health, and other critical medical fields. These projects sometimes involved genetic or hormonal manipulations in mice to model human diseases, which may have been mischaracterized as 'transgender' research.
Scientific and medical communities have expressed concern that these funding cuts imperil vital life-saving research. NIH scientists have described the cuts as damaging to ongoing studies that contribute to understanding and treating serious illnesses.
Fact-checking organizations and news outlets confirm that the government does not fund research explicitly aimed at 'making mice transgender' as a social or political experiment; rather, the work is focused on understanding biological processes relevant to human health.
Therefore, while Trump did make cuts to certain NIH-funded biomedical research projects, framing these cuts as motivated by a belief that researchers were 'making mice transgender' is an oversimplification and misrepresentation of the nature of the scientific work involved.