A Romanian computer hacker who unveiled the existence of Hillary Clinton’s private email server she used while secretary of state pleaded guilty to hacking-related offenses on Wednesday.<br />Marcel Lazar, who used the alias “Guccifer,” entered his guilty plea in U.S. District Court.<br />Sentencing was set for September 1.<br />In recent media interviews, Lazar claimed he easily hacked into Clinton’s controversial server.<br />But, the Justice Department nor investigators confirmed this claim.