Clinton is currently under scrutiny for using a private e-mail address for government business from a personal server during her time as secretary of state in the Obama administration.
Lehrer asked her, "Are you keeping a diary, you keep good notes of what's happening?"
Clinton responded, "Heavens no! It could get subpoenaed! I don't write anything down."
Clinton and her husband's lack of keeping documentation goes back to the scandals involving the Clinton White House's mishandling of FBI files of GOP members of Congress. Clinton never divulged who hired Craig Livingstone, the man who mysteriously ended up collecting all the files.