FILE – In this Jan. 30, 2013 file photo, retired astronaut Mark Kelly, left, husband of former Arizona Rep. Gabrielle Giffords who survived a gunshot to the head during the mass shooting in Tucson, Ariz., in 2011, shakes hands with National Rifle Association CEO Wayne LaPierre after they testified about gun violence and legislation during a hearing on Capitol Hill in Washington. Kelly got into a terse discussion at the witness table with LaPierre, and Giffords told the committee that Congress must reform the nation’s gun laws. Gayle Trotter, senior fellow with the Independent Women's Forum, who also testified, stands at center. (AP Photo/Susan Walsh, File)

Associated Press
FILE – In this Jan. 30, 2013 file photo, retired astronaut Mark Kelly, left, husband of former Arizona Rep. Gabrielle Giffords who  survived a gunshot to the head during the mass shooting in Tucson, Ariz., in 2011, shakes hands with National Rifle Association CEO Wayne LaPierre after they testified about gun violence and legislation during a hearing on Capitol Hill in Washington. Kelly got into a terse discussion at the witness table with LaPierre, and Giffords told the committee that Congress must reform the nation’s gun laws. Gayle Trotter, senior fellow with the Independent Women's Forum, who also testified, stands at center. (AP Photo/Susan Walsh, File)
FILE – In this Jan. 30, 2013 file photo, retired astronaut Mark Kelly, left, husband of former Arizona Rep. Gabrielle Giffords who survived a gunshot to the head during the mass shooting in Tucson, Ariz., in 2011, shakes hands with National Rifle Association CEO Wayne LaPierre after they testified about gun violence and legislation during a hearing on Capitol Hill in Washington. Kelly got into a terse discussion at the witness table with LaPierre, and Giffords told the committee that Congress must reform the nation’s gun laws. Gayle Trotter, senior fellow with the Independent Women's Forum, who also testified, stands at center. (AP Photo/Susan Walsh, File)
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