Caroline Kennedy, daughter of former President John F. Kennedy, warned senators of her “predator” cousin ahead of his first confirmation hearing on Wednesday. In a letter first reported by The Washington Post, she wrote that his victims included family members and parents of sick children.

In a deeply unsettling letter to lawmakers Tuesday, Caroline Kennedy, the cousin of Robert F. Kennedy Jr., warned senators not to confirm him as President Donald Trump’s pick to lead the U.S. Department of Health and Human Services.