President Donald Trump's nominee for surgeon general faces unexpected headwinds from key Senate Republicans troubled by her evasive responses on vaccine safety during confirmation hearings — a critical vulnerability that could derail her nomination.Nutrition influencer Casey Means Means cannot afford to lose a single GOP vote on the Senate Health Committee if all Democrats oppose her, making the hesitation from moderates particularly consequential, reported Axios Sen. Lisa Murkowski (R-AK), after grilling Means about her skepticism toward hepatitis B vaccination for newborns, indicated serious unresolved concerns. "I have some follow-on questions about some of the statements that she made when I was in the committee room about vaccines," Murkowski told Axios.When asked if she was satisfied with Means' responses, Murkowski bluntly replied: "If I was, then I wouldn't want to go back and see the responses to the other questions."Sen. Susan Collins (R-ME) similarly hedged, stating she "hasn't made a decision" and is sending "additional questions" to Means. Committee Chair Bill Cassidy (R-LA) repeatedly pressed Means on vaccine recommendations, including measles shots, but has not revealed his voting position.Means' core problem is her deliberate ambiguity on vaccination. Rather than unequivocally endorsing vaccines, she told the committee that individuals "should consult their doctors" while adding she's "supportive of vaccination" — language that fails to affirm public health consensus.As an ally of Health Secretary Robert F. Kennedy Jr., Means attempted redirecting focus toward "Make America Healthy Again" themes like addressing chronic diseases.Historically, the Senate health committee and broader Republican caucus have rubber-stamped Trump's health nominees, including Kennedy himself. Yet Means' inability to provide direct answers on vaccine policy has awakened Republican concerns about her qualifications.Her path forward remains genuinely uncertain — a rare crack in otherwise lockstep Republican support for Trump's controversial health appointments.