Caroline Kennedy wrote a scathing letter to key senators Tuesday, calling her cousin Robert F. Kennedy Jr. a “predator” addicted to attention from airing dangerous views on vaccinations and someone who is unfit to be the nation’s health secretary.

She urged lawmakers, who will be questioning Kennedy at his confirmation hearings Wednesday and Thursday, to reject his nomination. She cited his lack of experience, misinformed views on vaccines and personal attributes. In the letter, she described how he led other family members “down the path of drug addiction.”

“His basement, his garage, and his dorm room were the centers of the action where drugs were available, and he enjoyed showing off how he put baby chickens and mice in the blender to feed his hawks,” Kennedy wrote.

Her letter was first reported in The Washington Post. Kennedy expressed particular outrage over the new disclosures in his ethics agreement filed with the Senate, which she described as outlining how his “crusade against vaccination has benefited him.”

— The New York Times