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But, they added, "additional and detailed expert analysis of the venue research and media surrounding this case is required to support a motion to change venue."
Tsarnaev's lawyers asked the judge to give them more time to file their request for a change of venue, which is currently due next Wednesday. Prosecutors haven't yet responded to the request, and the judge hasn't ruled on the motion.
Under federal law, granting a change of venue wouldn't necessarily mean moving the case out of Massachusetts, although it would mean moving it out of Boston.
Lawyers for Tsarnaev have previously remarked on the "saturation coverage" of the trial in court documents.