"No, but she also did nothing illegal," Davis responded.
Wallace insisted that the email rules were different for Clinton than for Colin Powell, who also used private email while serving as secretary of state. And he argued that the Obama administration told employees to use government email.
"In fact, the Obama White House has been unclear about what the policy is," Davis hit back.
Wallace then challenged Davis, asking why Clinton ordered her State Department employees to used their government emails in 2011, but did not do so herself.
"I can explain that by saying that a secretary of state traveling to 111 countries might be needing to have one email system versus people in the Department who should use the official system," Davis said.
But Wallace did not accept that answer, repeatedly asking Davis why Clinton used her own email.
Throughout the heated debate, Wallace and Davis constantly cut each other off and spoke over each other.
Watch the clip below: