U.S. Health Secretary Robert F. Kennedy Jr. announced that COVID-19 vaccines will no longer be recommended for healthy children and pregnant women.

A medical officer at the US Centers for Disease Control and Prevention who was working on the committee that was weighing changes to the agency’s Covid-19 vaccine recommendations resigned on Friday, the same day officials the US Department of Health and Human Services announced they had removed the CDC recommendation for pregnant women and healthy children to get Covid-19 vaccines.

A top COVID-19 vaccine advisor has reportedly resigned from her role at the Centers for Disease Control and Prevention in the wake of an abrupt vaccine policy change announced by Robert F. Kennedy Jr.