Sen. Bill Cassidy (R-La) on Sunday slammed Donald Trump for casting doubt on vaccines after providing the crucial vote to confirm prominent anti-vaxxer Robert F. Kennedy Jr. as the top public health official in the United States.

Last week, Trump signed an executive order to limit childhood vaccinations and split the MMR vaccine into three separate shots. At the event, Trump spouted unscientific lies, baselessly claiming vaccines cause autism and that little children have had inoculations the size of soda bottles poured into their bodies.

At one point, he falsely claimed that the MMR vaccine is “quite lethal,” amid a record-breaking outbreak of Measles in the United States.

“Nothing bad can happen from what we’re doing,” Trump claimed. “Nothing bad could happen. The worst thing that would happen would be nothing happens. We’re not gonna lose anything. At the same time, we could gain tremendous, we could save hundreds of thousands of lives, millions of lives.”

On Sunday, Cassidy told CNN’s Jake Tapper on State of the Union that Trump’s comments are “crazy” and “stupid.”

Cassidy, a physician, noted that the change to the vaccine schedule will mean more doctor visits for parents of young children, which would lead to higher costs and strain on working families.

“If it wasn’t so potentially tragic, you would break out laughing at a comment like that. But let’s just take it from the perspective of the parent. Now instead of going to the doctor twice to get their child vaccinated, they have to go six times. Instead of the child getting two jabs, they get six jabs. Instead of mom or dad missing work twice, you know, coming out of their pocket, if will, to take their child to the doctor, they have to miss work or take vacation or personal leave six times. This is inconvenient, ” he added.

Cassidy continued, “They have to miss work or take vacation or personal leave six times. This is inconvenient. It’s going to contribute to an increased loss of income. So, in fact, it will be counterproductive. And so it is wrong on so many levels……There’s a lot of bad things that will come out of this.”

Cassidy provided the crucial vote to advance the nomination of Kennedy to serve as Health and Human Services secretary, despite his years-long campaign of spreading misinformation about vaccines and autism.

Kennedy appeared with Trump in the Oval Office, where he similarly spewed anti-vax rhetoric with no basis in science while insisting that Trump’s actions are what “gold-standard science means.”

Asked if he regrets voting for Kennedy, Cassidy deflected, telling Tapper that “you have to live life living forward.

“Yeah, again, people always want to bring that up, and all I can say is you have to live life living forward,” he said, adding that Tapper is feeding into the distraction by asking him about Kennedy’s anti-vax past.

“I think actually people bringing this up now distract from actually what we should be speaking about,” argued Cassidy. “In fact, you’re playing into this.”