Why isn't Sanders using the email scandal against Clinton?

Why isn't Sanders using the email scandal against Clinton?

Former Reagan/Bush National Campaign Director Ed Rollins and Democratic Strategist Doug Schoen with the latest on the 2016 presidential race.

Why isn't Sanders using the email scandal against Clinton?
Clinton, Sanders Unite on Email Controversy
(Democratic Debate) Bernie Sanders: Why I'm sick of Clinton's email
Sanders jumps in to defend Clinton on email scandal
Sanders on Clinton email scandal: Democratic superdelegates will be keeping it in mind
Hillary Clinton's email scandal becomes discussion point during Democratic debate
Clinton's Email Controversy: More Potential Pitfalls
Sanders: Clinton emails are 'a serious issue'
Why the Hillary Clinton Email Scandal Isn't Over
The Other Debate Scandal: Democrats & the DNC
Sanders supporters revolt against DNC
Clinton laughs off Sanders' complaints about superdelegates
WikiLeaks Dump Could Confirm Sanders Fans' Worst Fears About The DNC
Sanders vs. Clinton: A Study in Contrasts
Clinton isn’t counting her chickens
Will new details on email controversy sink Clinton?
Were Clinton’s email security features disabled?
Judge Jeanine: Never more ashamed after Hillary decision
Justice Dept. Won’t Pursue Charges Against Hillary Clinton
Should Clinton say no to a potential FBI interview?