The U.S. Department of Justice has given immunity to a State Department employee who set up an email server for former Secretary of State and current Democratic presidential front-runner candidate Hillary Clinton, the Washington Post reported on Wednesday.

A senior U.S. law enforcement official said the FBI had secured the cooperation of Bryan Pagliano, who worked on Clinton’s 2008 presidential campaign before setting up the server in her New York home in 2009, the newspaper reported.