Sen. Dianne Feinstein, D-Calif., right, sits next to the Senate Judiciary Committee's ranking Republican, Sen. Charles Grassley, R-Iowa, during a hearing on the Assault Weapons Ban of 2013, Wednesday, Feb. 27, 2013.. (AP Photo/Susan Walsh)

Photo by: Susan Walsh

Sen. Dianne Feinstein, D-Calif., right, sits next to the Senate Judiciary Committee's ranking Republican, Sen. Charles Grassley, R-Iowa, during a hearing on the Assault Weapons Ban of 2013, Wednesday, Feb. 27, 2013.. (AP Photo/Susan Walsh)