Sousa, an international student from Portugal, had been detained in connection with a sexual assault near campus.
On the day of his arrest, SDSU administrators suspended Sousa. Days after being arrested, criminal charges against Sousa were dropped by the District Attorney.
Lombardo says he needs this information to form a defense for his client before the expulsion becomes final -- something that, according to Lombardo, could tarnish his client's reputation and opportunities forever.
"The expulsion is a very public reprisal that will live on forever on the Internet and will impede his ability to get into another university and to get a job in the future. This is a very severe sanction," said Lombardo.
SDSU denied to comment about the case.