What are the potential consequences for Hillary Clinton for using a personal email account during her time as secretary of state? On Wednesday, the House Select Committee on Benghazi issued her a subpoena for all communications related to the investigation. Judge Andrew Napolitano sat down with Martha MacCallum to go over the two potential criminal investigations that the former First Lady could face. 1. The less serious possibility is an investigation similar to what was brought against Gen. David Petraeus, who pleaded guilty this week for keeping classified documents in an unsecured location.