Nolan also said that Rana, with an estimated net worth of $1.6 million, has the financial resources to flee the country.
The 48-year-old Rana is charged with taking part in a plan to attack a Danish newspaper that in 2005 published 12 cartoons depicting the Prophet Muhammad. The cartoons prompted weeks of protests in the Muslim world.
Rana is also accused by federal prosecutors of knowing in advance that a Pakistan-based terrorist group would attack Mumbai. A federal filing on Monday revealed that Rana and an accused co-conspirator, David Coleman Headley, were secretly recorded during a car ride prior to the attack on the Indian city.
The attacks left 166 people dead.