Fernandez-Ruiz v. Gonzales, 468 F.3d 1159 (9th Cir. Nov. 15, 2006) ("Whether a particular offense constitutes an aggravated felony for which an alien is removable is also subject to de novo review."), citing Rivas-Gomez v. Gonzales, 441 F.3d 1072, 1074 (9th Cir. 2006).