'What a jacka--': Conservatives hammer Dem senator's 'droning monologue' during RFK Jr hearing

"Americans are going to need to hear a clear and trustworthy recantation of what you have said on vaccinations, including a promise from you never to say vaccines aren't medically safe when they, in fact, are, and making indisputably clear that you support mandatory vaccinations against diseases where that will keep people safe," Whitehouse said. "You're in that hole pretty deep."

Whitehouse, who attended law school with Kennedy where the two were friends, used the majority of his time to list concerns about Kennedy, allowing the HHS hopeful a small window at the end to address the line of questioning.

Whitehouse's comments quickly drew criticism from conservatives on social media. 

Fox News Digital reached out to Whitehouse's office for comment but did not immediately receive a response.

Opposition to Kennedy's nomination has been fierce, with advocacy groups running ad campaigns urging senators to vote against his confirmation mainly due to his past skepticism of some vaccines.