She stuck to her usual refrain, saying she was simply "repeating the facts" and "the facts are I did not send nor did I receive material marked classified."
The presidential hopeful added that the "partisan-ization" of her private email server use wasn't an issue that Iowans -- or any voters she's met with -- cared about.
"It's not anything that people talk to me about as I travel around the country," Clinton said. "It is never raised in my town halls. It is never raised in my other meetings with people."
People in Iowa are "going to want to vote for somebody that they believe will deliver results for them," she added.
CBS News learned Friday that at least one of the four emails being disputed as classified has already been released into the public domain unredacted. The State Department published the email in full during a court-mandated release of 296 Clinton emails, all relating to Libya and the 2012 Benghazi attack.
On Friday, as she lauded the benefits of social media platform Snapchat, Clinton had made light of the controversy surrounding deleted emails.
"You may have seen that I recently launched a Snapchat account," she said at a Democratic fundraiser in Iowa. "I love it. I love it. Those messages disappear all by themselves."