CHICAGO (CBS) — A federal judge has agreed to push back the trial of a Chicago businessman charged in connection with the 2008 terrorist attacks in Mumbai, India.

Defense attorneys for Tahawwur Rana had asked for a delay in his Feb. 14 trial to have more time to prepare.

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On Friday, U.S. District Judge Harry Leinenweber agreed to move the trial date to May 16.

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Much of the case relies on classified material, making pretrial preparations more difficult. During the trial, some sensitive material might be presented behind closed doors.

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Rana has pleaded not guilty to charges accusing him of providing cover for a man who’s admitted to scouting sites for the attack in Mumbai, which left more than 160 people dead.