Donald Trump faces significant Republican backlash over his recent claims linking Tylenol (acetaminophen) use during pregnancy to autism, with GOP senators demanding scientific evidence to support such assertions. Senator Bill Cassidy, chair of the Senate health committee, criticized the administration's unsubstantiated claims and called for transparency, emphasizing that medical guidelines should be based on scientific data. Other senators, including Susan Collins and Lisa Murkowski, expressed concern over the influence of political pressures on vaccine and medication policies. Major medical organizations, such as the American College of Obstetricians and Gynecologists, have reaffirmed the safety of Tylenol for pregnant women, citing studies that found no significant link between acetaminophen use and neurodevelopmental disorders in children. Meanwhile, Vice President JD Vance advised pregnant women to follow their doctors' guidance regarding Tylenol, contrasting Trump's strong discouragement of the drug. President Trump’s remarks, which suggested that women should avoid Tylenol unless absolutely necessary, drew criticism from health experts, including Dr. Steven Fleischman, who highlighted that current scientific evidence does not support the claim of a causal link. Former President Barack Obama also criticized Trump’s statements, calling them harmful to public health and undermining scientific consensus. Overall, the controversy underscores ongoing debates over vaccine and medication safety during pregnancy, with political and expert voices diverging on the issue.