The health secretary is at odds with his own agency. The director of the National Institutes of Health, Jay Bhattacharya, appeared before the Senate Committee on Health, Education, Labor, and Pensions on Tuesday to discuss efforts to modernize the public health sector. But his appearance spilled a deeper truth when ranking member Senator Bernie Sanders insisted that Bhattacharya clarify his position on Health Secretary Robert F. Kennedy Jr.’s deeply held belief that vaccines are linked to