Maybe McCarthy meant to say the email mess, which has hurt Hillary. Benghazi might come back and hurt her depending on what the deleted emails say, that Hillary said were personal, if there is something embarrassing on Benghazi. If there is, then she is toast. But first the emails need to be recovered, and then released to the extent not personal.
He meant just what he said. It doesn't take much to know why that committee was set up, but McCarthy just let it slip out. Your leaders are getting sloppy.