In March 2015, it became publicly known that Hillary Clinton, during her tenure as United States Secretary of State, had exclusively used her family's private email server for official communications, rather than official State Department email accounts maintained on federal servers. Those official communications included thousands of emails that would later be marked classified by the State Department retroactively.
Some experts, officials, and members of Congress have contended that her use of private messaging system software and a private server violated State Department protocols and procedures, as well as federal laws and regulations governing recordkeeping.
This is a federal offense and justice can only be served by prosecuting Hillary Clinton and sending her to prison.