Weldon, 71, is a medical doctor and former lawmaker who served in the House, representing Florida. The former congressman has been a strong critic of the CDC, especially its vaccine program. Weldon has championed the long-debunked notion that thimerosal, a vaccine preservative, is linked to autism.

Weldon has questioned the safety of some vaccines and advocated for limits on abortion. He'll be the first CDC director to face Senate confirmation.

Makary and Weldon, who have criticized the agencies they may soon run, were joined by Janette Nesheiwat, Trump’s pick to be surgeon general.

While in Congress, Weldon introduced a bill that would give responsibility for the nation's vaccine safety to an independent agency within the HHS.

President-elect Donald Trump has tapped former Florida Rep. Dave Weldon, a physician and vaccine safety skeptic, to lead the Centers for Disease Control and Prevention.

President-elect Donald Trump has announced several additional Cabinet nominations to positions involving national health, labor, agriculture and security.