Martinez v. U.S. Atty Gen., 446 F.3d 1219 (11th Cir. Apr. 21, 2006) (exceptional and extremely unusual hardship requirement for non-LPR cancellation of removal is a discretionary issue, and judicial review is therefore barred).
http://caselaw.lp.findlaw.com/data2/circs/11th/0416740p.pdf