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)
New Jersey Gov. Chris Christie sits next to first lady Michelle Obama as President Barack Obama welcomed the governors of the National Governors Association to the 2013 Governors’ Dinner at the White House in Washington, Sunday, Feb. 24, 2013. (AP Photo/Susan Walsh)
** FILE ** New Jersey Gov. Chris Christie sits next to first lady Michelle Obama as President Barack Obama welcomed the governors of the National Governors Association to the 2013 Governors’ Dinner at the White House in Washington, Sunday, Feb. 24, 2013. (AP Photo/Susan Walsh)
** FILE ** Boeing Commercial Airplanes President Ray Conner (center), flanked by Transportation Secretary Ray LaHood (left) and Federal Aviation Administration chief Michael Huerta, speaks during a news conference at the Transportation Department in Washington on Friday, Jan. 11, 2013, to discuss a comprehensive review of the Boeing 787's critical systems, including its design, manufacture and assembly. (AP Photo/Susan Walsh)
** FILE ** In this Feb. 13, 2013, file photo, Defense Secretary Leon Panetta speaks during his last news conference as defense secretary at the Pentagon in Washington. (AP Photo/Susan Walsh, File)
U.S. Defense Secretary Leon Panetta speaks to the troops during a visit to Kandahar Airfield in Kandahar, Afghanistan, Thursday, Dec. 13, 2012. (AP Photo/Susan Walsh, Pool)
** FILE ** In this Feb. 13, 2013, file photo, Defense Secretary Leon Panetta speaks during his last news conference as defense secretary at the Pentagon in Washington. (AP Photo/Susan Walsh, File)
** FILE ** In this Feb. 13, 2013, file photo, Defense Secretary Leon Panetta speaks during his last news conference as defense secretary at the Pentagon in Washington. (AP Photo/Susan Walsh, File)
** FILE ** President Obama and Israeli President Shimon Peres share a toast after Mr. Obama presented Mr. Peres with the Presidential Medal of Freedom at a dinner in the East Room of the White House in Washington on Wednesday, June 13, 2012. (AP Photo/Susan Walsh)
