The shooter passed a background check, Harry is looking for registration and confiscation.
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Speaking to reporters on April 3rd, Senate Majority Leader Harry Reid (D-NV) said the shooting at Fort Hood should revive the gun control push.

According to The Washington Post, Reid said, “As I was told today, [Army Spc. Ivan Lopez] bought his gun a day or two before he killed these people. Couldn’t we at least have background checks so that people who are ill mentally, or who are felons, shouldn’t be able to buy guns?”

This is somewhat misleading because “law enforcement officials, speaking on condition of anonymity, said the pistol used by Lopez… was purchased legally last month… at Guns Galore.” This means Lopez went through a background check to get the gun, which also means the failed Senate gun bill would not have stopped Lopez from getting it.