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Weldon was told Wednesday night that his nomination was being withdrawn, another Trump administration official said. The White House decided to pull Weldon’s nomination when it became clear that he would not have the votes to be favorably reported out of committee because of his past controversial comments about vaccines, the official said.