Dave Weldon is likely to be questioned about measles infections, a plan to study a debunked link between vaccines and autism, and the ongoing bird flu outbreak.

Weldon marks at least the third speed bump the Trump administration hit in its confirmation process after two nominees, former Rep. Matt Gaetz and Chad Chronister, withdrew.

The White House has withdrawn its nomination of Dr. Dave Weldon to serve as the director of the US Centers for Disease Control and Prevention, two Trump administration official familiar with the decision told CNN.