The Benghazi attack took place in 2012
en.wikipedia.org
The story about Hillary's email tactics
with respect to classified info was first mentioned by (ironically) the "liberal' NYT on March of 2015 (and at the time she was still under attack by the GOP). Previous accounts had mentioned the hacking of her pribvate emails but did not link the story to potential violation of handling classified info. They were using such info to attack Clinton for her role in the Behghazi attack.
I post the huff link only because NYT is behind paywall. Alternatively, one can use the wayback machine to read the NYT article
Bombshell New York Times Report On Hillary Clinton Email Account Disputed
www.huffpost.com
and reports by Trump's federal departments about Hillary's emals were published as late as in October 2019
The three-year-long investigation concluded that 38 individuals committed a total of 91 security violations.
www.politico.com
and that was after the Democrats clearly broke away from Clinton!