Dr. Heidi Overton is likely to face questions about vaccines and the abortion drug mifepristone when she appears before a Senate committee Thursday for her confirmation hearing as the next commissioner of the Food and Drug Administration. Read more: ↧ Dr. Heidi Overton to appear before Senate committee for confirmatio... Dr. Heidi Overton is set to appear before a Senate committee on Thursday for her confirmation hearing as the next commissioner of the Food and Drug Administration.