A revolving door inside the FDA has captured the attention of a group of Republican lawmakers. Just a few months after Leona Brenner-Gati was named Acting Deputy Commissioner for Medical Products and Tobacco to replace the outgoing Steven Spielberg, who served only a brief stint at the post, Brenner-Gati is gone as well. And the lawmakers are demanding that FDA Commissioner Margaret Hamburg detail exactly what she did there as well as the circumstances behind the sudden exit.