The man who hopes to be President Donald Trump's health secretary said he needed to see data showing vaccines are safe, but when an influential Republican senator did so, he dismissed it.

Sen. Elizabeth Warren discussed her viral back-and-forth with RFK Jr. on Thursday during an interview on "The View," saying the U.S. could be left with "no vaccines."

If he's put in charge of Health and Human Services, he has a whole tool box of ways that he very quietly can undermine vaccines and vaccine manufacturers—and he can get rich doing it.”