Since being named U.S. Health and Human Services Secretary earlier this year, Robert F. Kennedy Jr. has targeted vaccine policy, and in May withdrew a federal recommendation for COVID shots for pregnant women and healthy children. Kennedy toured the site on Monday and said no one should face violence while working to protect the health of others.

The gunman in the deadly shooting outside the Centers for Disease Control and Prevention's Atlanta headquarters had no known criminal history, but had left a written note expressing his "discontent with the COVID-19 vaccination,