As I understand almost 90 percent of those interviewed, including law enforcement and NRA members, believed that everyone purchasing a gun must first pass a background check. Forty percent of those who purchase guns are not subject to background checks.
Also, law enforcement especially supports the imprisonment of "straw purchasers," those who purchase guns for those who cannot legally purchase them (purchases for youth gang members, Mexican cartels, etc.). Currently, there is no law prohibiting "straw purchases."
I guess the Constitutional phrase "We The People" does not have much sway with the Republican Party members in the U.S. Senate, who voted almost 90 percent against the background checks and imposing a penalty for "straw purchases."