Biden spoke briefly to reporters after leading a two-hour roundtable discussion about what to do in the wake of the elementary school shooting last month in Newtown, Conn., that left 20 students and six adults dead. Also participating in the roundtable were Obama administration officials and a few people who served on a Virginia task force that made recommendations after the Tech shooting that left 32 dead - the largest mass shooting in U.S. history.

"It's a national tragedy and a window into the vulnerability people feel about their safety and the safety of their children," Biden said of Newtown.