Billionaire businessman Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE on Wednesday doubled down on his controversial stance that vaccinations are linked to what he described as an autism “epidemic.”

“I’ve seen it,” he said at the second main-stage GOP debate on CNN Wednesday night.

“You take this little beautiful baby, and you pump — it looks just like it’s meant for a horse," he said of vaccines.

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"We’ve had so many instances ... a child went to have the vaccine, got very, very sick, and now is autistic."

The GOP front-runner said he still supported certain vaccines, but in smaller doses over a longer period of time. Under current procedures, he said it's dangerous for the public.

“Autism has become an epidemic, he said. “It has gotten totally out of control.”

Trump was one of several Republican candidates to question the current medical standards for vaccination, including two medical doctors: neurosurgeon Ben Carson and Sen. Rand Paul (R-Ky.), an ophthalmologist.

Responding to a question, Trump said certain vaccines are “very important.” But he added that there should be “some discretion” given to families — a stance increasingly popular within the GOP despite rising numbers of preventable diseases like the measles.

Carson denied that vaccinations had been linked to autism, citing “numerous studies” that have failed to find any correlations. But he suggested that there still could be a link.

“It has not been adequately revealed to the public what’s actually going on,” Carson said.

Paul, who has previously faced flak for suggesting that vaccines are linked to mental disorders, appeared to walk back his stance on Wednesday.

He described vaccines as “one of the greatest medical discoveries of all time,” while adding, “I’m also for freedom.”

“I ought to have the right so spread my vaccines out, at the very least,” Paul said.