Tsarnaev's lawyers argued in a motion filed last month that so-called "special administrative measures" are impairing their ability to defend him. The measures are often used in terrorism cases and restrict access to the mail, the media, the telephone and visitors.
Oral arguments are scheduled today in US District Court. Tsarnaev is accused in twin bombings near the finish line of the April 15 marathon. Three people were killed and more than 260 were injured.
