What term describes unauthorized access to sensitive information by a foreign national in the U.S.?

The correct term that describes unauthorized access to sensitive information by a foreign national in the U.S. is "Unauthorized Disclosure." This term specifically relates to the act of revealing or making sensitive information accessible without permission, particularly in a context where the individual accessing the data does not have the authority to do so. Unauthorized disclosure can involve foreign nationals, and it highlights the security risks associated with sensitive information being exposed improperly.

While "Security Breach" refers broadly to any incident where unauthorized access occurs, it does not specifically indicate the unauthorized nature or the actor involved. "Data Theft" implies that the data has been stolen and removed, which may not always happen in cases where information is merely accessed without right. "Information Misuse" is a more general term that may refer to valid users accessing data for inappropriate purposes, which does not precisely capture the essence of unauthorized actions taken by foreign nationals.

Thus, "Unauthorized Disclosure" most accurately encapsulates the scenario presented in the question as it focuses on the unauthorized access and dissemination of sensitive information.