Recently fired members of a committee that advises the federal government on immunization safety lashed out at Health and Human Services Secretary Robert F. Kennedy Jr., saying that their terminations will limit access to vaccines and put American lives at risk.

Sen. Bernie Sanders (I-VT) is requesting the Senate Committee on Health, Education, Pensions, and Labor to investigate Health and Human Services Secretary Robert F. Kennedy Jr. after he fired all members of a key vaccine panel last week.

Robert F. Kennedy Jr. dismissed all members of the CDC’s Advisory Committee on Immunization Practices, which recommends which shots insurance should cover for specific groups.