According to Andrew McCarthy, the FBI declined to prosecute Hillary for using a private e-mail server for classified information because her correspondents included Obama and he would also be guilty of the same crimes. http://www.nationalreview.com/artic...-obama-emails-key-decision-not-indict-hillary by ANDREW C. MCCARTHY January 23, 2018 From the first, these columns have argued that the whitewash of the Hillary Clinton–emails caper was President Barack Obama’s call — not the FBI’s, and not the Justice Department’s. (See, e.g., here, here, and here.) The decision was inevitable. Obama, using a pseudonymous email account, had repeatedly communicated with Secretary Clinton over her private, non-secure email account.