Happening now in the hot seat, HHS Secretary Robert F. Kennedy Jr. is on Capitol Hill

to face lawmakers as the backlash to his policies is growing.

Clearly growing.

We want to welcome our viewers here in the United States and around the world.

I'm Wolf Blitzer with Pamela Brown and you're in the Situation Room.

This is CNN Breaking News. And we begin with the breaking news.

Secretary Robert F. Kennedy Jr. is up on Capitol Hill right now to testify before senators as his Department

of Health and Human Services is roiled in controversy. Kennedy, canceling millions in vaccine

research, funding and dismantling a key panel of experts who make vaccination recommendations

to the federal government. He also recently ousted the CDC director after just weeks on the job over a dispute on vaccine policy.

And she is now speaking out writing in the Wall Street Journal that, quote,

the CDC can't fulfill its obligation to the American people if its leader can't demand proof and decision making.

If discarding evidence for ideology becomes the norm, why should parents, physicians, or public trust the CDC's guidance?

And there's more, more than 1,000 current and former employees of Kennedy's own department are now calling for his resignation.

Let's go live now to CNN Chief Medical Correspondent, Dr. Sanjay Gupta, and CNN's Arlet

Signs, who is on Capitol Hill covering this hearing. Sanjay, let's start with you and this new

op-ed from the former CDC director. Pretty significant.

I think really significant.

I mean, it's a really strong letter.

It talks about the fact that she felt like the agency there is sabotage that is happening

there, not reform.

I think one of the things that really struck me when I read this op-ed was there was

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