The issue arose while Graham was questioning whether any other cabinet member in the Obama administration used a private email account besides former Secretary of State Hillary Clinton.
The senator criticized Clinton for using a personal email account and said he wants full access to her emails from her time as secretary of state.
"Did she communicate on behalf of Clinton Foundation as secretary of state? Did she call the terrorist attack in Benghazi a terrorist attack in real time?" Graham asked. "I want to know."
Watch the clip via NBC:
This post has been updated.