A terror suspect challenging the constitutionality of the National Security Agency’s warrantless surveillance program wants prosecutors to reveal how they built their case against him.

In motions filed Monday in federal court in Denver, attorneys for Jamshid Muhtorov said they need to know about the government’s surveillance methods so they can challenge their legality in court.

Attorneys want to know about each surveillance technique, when it was used and what evidence it yielded so they can determine whether investigators illegally gathered evidence against Muhtorov and co-defendant Bakhityor Jumaev, federal public defender Virginia Grady wrote in the filing.

Muhtorov was accused in 2012 of providing material support to an Uzbek terrorist organization active in Afghanistan. The evidence against him consists largely of phone calls and Internet communications.

Muhtorov has denied the charges against him. Prosecutors have not responded to the filings.