Officials from South Carolina, Texas, Minnesota and North Carolina are among the witnesses expected to testify.
"Now, there was a time in my legislative career that I tried to work with the National Rifle Association, but the NRA today is a far cry from [the] sportsmen's organization that I once supported," the Nevada Democrat said. "The NRA once called mandatory background checks 'reasonable.' That's what they said. I'm not making this up."
Reid said on the Senate floor that the NRA and its leadership has "transformed into a quasi-militant wing of the Republican Party. They're being pushed more and more into the camp of guns for everybody any time they want 'em," also mentioning the emergence of a conservative firearms group known as the Gun Owners of America.