Neil Heslin, the father of a six-year-old boy who was slain in the Sandy Hook massacre in Newtown, Conn., on Dec. 14, holds a picture of himself with his son Jesse and wipes his eye while testifying on Capitol Hill in Washington, Wednesday, Feb. 27, 2013, before the Senate Judiciary Committee on the Assault Weapons Ban of 2013. (AP Photo/Susan Walsh)

Donna Soto, mother of slain Sandy Hook Elementary teacher Victoria Soto, holds here phone with a photo of her daughter on it while she listens to testimony on Capitol Hill in Washington, Wednesday, Feb. 27, 2013, during the Senate Judiciary Committee on the Assault Weapons Ban of 2013. (AP Photo/Susan Walsh)

FILE - In a Jan. 28, 2013 file photo Neil Heslin, holds a picture of himself with his son Jesse and wipes his eye before testifying at a hearing in the Legislative Office Building in Hartford, Conn., Heslin will testify to the Senate Judiciary Committee Wednesday Feb. 27, 2013. (AP Photo/Jessica Hill)

Senate Judiciary Committee members, Sen. Dianne Feinstein, D-Calif., center, sitting next to the committee's ranking Republican, Sen. Charles Grassley, R-Iowa, left, talks with Sen. Richard Blumenthal, D-Conn., on Capitol Hill in Washington, Wednesday, Feb. 27, 2013, prior to the start of the committee's hearing on the Assault Weapons Ban of 2013. (AP Photo/Susan Walsh)

With photos of Sandy Hook Elementary School victims in the background, Senate Judiciary Committee member, Sen. Dianne Feinstein, D-Calif. speaks on on Capitol Hill in Washington, Wednesday, Feb. 27, 2013. during the committee's hearing on the Assault Weapons Ban of 2013. (AP Photo/Susan Walsh)

Neil Heslin, the father of a six-year-old boy who was slain in the Sandy Hook massacre in Newtown, Conn., on Dec. 14, holds a picture of himself with his son Jesse and wipes his eye while testifying on Capitol Hill in Washington, Wednesday, Feb. 27, 2013, before the Senate Judiciary Committee on the Assault Weapons Ban of 2013. (AP Photo/Susan Walsh)

Milwaukee Police Chief Edward Flynn responds to a question by Senate Judiciary Committee member Sen. Lindsey Graham, R-S.C. as he testifies on Capitol Hill in Washington, Wednesday, Feb. 27, 2013, before the committee's hearing on the Assault Weapons Ban of 2013. (AP Photo/Susan Walsh)