Hillary Clinton’s campaign welcomed news that the Democratic front-runner’s former top IT staffer is now cooperating with the FBI's probe of her private email server — following reports that the Justice Department granted the staffer immunity from prosecution.br Bryan Pagliano — who worked for Clinton’s 2008 campaign, then followed her to the State Department — set up her controversial email system that is currently the center of the FBI's investigation into whether the homebrewed server put classified material at risk.br The latest email revelation follows a strong showing on Super Tuesday, where Clinton gained a significant edge over her rival, Sen. Bernie Sanders.br But Pagliano's deal, and the promise of more closed-door testimony about the email setup, suggests the issue will continue to dog the Democratic frontrunner.