The judge says a potential life sentence if convicted means Subasic is a flight risk.
Daniel Boyd, the alleged ringleader of the terror plot, is behind bars in Farmville, Va. Along with is two sons and three of the other suspects. They were moved to Va. after a judge denied them bail on Aug. 5.
Authorities are still looking for an eighth suspect who is believed to be in Pakistan.
There are new reports that Boyd may have exaggerated some of his fighting in the Middle East in the late 1980s.
According to the Associated Press, several experts doubt stories he told of fighting against Soviets in Pakistan and Afghanistan 20 years ago.