He said he was sick and tired of hearing about the emails. He didn't say the FBI/DOJ investigation should end.
I just wish politicians of all stripes would get it in their heads that the proper response to a question about anything related to an ongoing investigation is "I'm sorry, but due to the fact that there's an ongoing investigation on that subject, I won't comment at this time." Simple, right? But democrats can't seem to do it, republicans can't seem to do it, heck, the
sitting president can't seem to do it. My objection is not to the change in Mr. Sanders' response, my objection is that he (and many others) feel the need to play politics with what I believe to be a very serious matter: those damn emails.