Billionaire presidential contender Donald Trump made a "huge" splash on the GOP debate stage Wednesday in a sparring match with Dr. Ben Carson over whether vaccines cause autism.

Trump's response starts at 1:08.

"There have been numerous studies, and they have not demonstrated that there is any correlation between vaccinations and autism," Dr. Carson claimed, responding to whether he believed Trump should cease assertions that vaccines cause autism.

"He can read about it if he wants to. I think he's an intelligent man and will make the correct decision after getting the real facts."

The hotel mogul, however, held firm, embracing his previous stance that, from first hand experience, vaccines are distributed at too high a frequency and too young an age, and may contribute to the rise in childhood autism.