Without a single data point as evidence that any of the weapons used in mass shootings of the last two decades were purchased at gun shows, this administration uses mass shootings as their reason for going after the "gun show loophole".
The federal government has no constitutional authority to require background checks prior to a gun purchase, limit the sort of gun purchased, or keep a data base of gun owners or permit holders. All these governmental actions are constitutionally reserved to "the States and to the people" (10th Amendment). And for those politicians and judges who have trouble with English, the 2nd Amendment prohibits any "infringement" upon the peoples' right to own guns of ANY sort. Where is there any room for debate?