Matter of Kotliar, 24 I. & N. Dec. 124 (BIA 2007) (noncitizen need not be charged with the ground of deportation that provides the basis for mandatory detention under INA 236(c)(1) in order to be considered an alien who "is deportable" on that ground).
http://www.usdoj.gov/eoir/vll/intdec/vol24/3558.pdf