The worst day of his presidency was the day he had to fess up about his lies.
Note: he doesn't mention anything to do with something that happened to the COUNTRY.
Dan: "Is that the worst thing you ever did"
Slick: "In my whole life? Oh, I don't know..."
How about the first attack on the World Trade Center, Somalia, the USS Cole, and ad infinitum on all the things he just turned a blind eye to. Or, how about six years ago when Al Qaeda first started planning 9/11?