The case was turned over to jurors a day after closing arguments wrapped up in the month-long trial.
Mohammad Omar Aly Hassan, Ziyad Yaghi and Hysen Sherifi have all pleaded not guilty.
Prosecutors have said they were part of a group of men led by Daniel Boyd who raised money and trained to carry out acts of terrorism. Boyd and his two sons pleaded guilty earlier this year in the case.
Attorneys for the men said they're guilty of nothing more than discussing ideas that others might find objectionable.