Here:
Nevertheless, members of Congress, like reporters and the public, had a right to access Clinton’s emails as part of their investigation regardless of motive. And were it not for the dogged partisanship of Republicans and the actions of a hacker, Clinton’s private email system might never have come to light.
Nine days after the Benghazi attack, Congress asked for any State Department emails related to the subject. It took two years before Congress was given access to a single email from Clinton’s private account. By then, four House committees and two Senate committees had already issued their reports on the issue.