The perp should be transferred to the military so he can be waterboarded, THEN sent to GITMO.
This perp is a naturalized American citizen, until such time as his citizenship is revoked. There is plenty of legal precedence to revoke his citizenship, to the point it would be a quick and simple case to prove. (Therefor the Holder Justice Dept, and Carmen Ortiz will NOT pursue this line of prosecution.)
Same goes for Faisal Shahzad, the 2010 Times Square bomber.
Good background read on this: