Shewchun v. Holder, 658 F.3d 557 (6th Cir. Sept. 8, 2011) (former ICE Chief Counsel only needs to recuse herself where she took part in the particular case before her, based on intepretation of 28 U.S.C. 455(a), requiring recusal by federal judges in any proceeding in which his impartiality might reasonably be questioned.); see Petrov v. Gonzales, 464 F.3d 800, 803 (7th Cir. 2006).