On Wednesday, the Senate is expected to vote on the latest assault on public safety in the name of gun ownership. Introduced as an amendment to the military’s budget bill by Senator John Thune, a Republican of South Dakota, this radical measure would nullify the laws of almost every state, subjecting police officers to greater risk and increasing the potential for gun violence.

Nearly all states issue licenses to carry concealed firearms, but the criteria for granting such permits vary widely, and it is now, sensibly, up to each state to decide whether to accept another state’s permits.

At least 35 states prevent people from carrying concealed weapons if they have certain misdemeanor convictions. At least 31 states prohibit alcohol abusers from obtaining a concealed carry permit and require gun safety training. The Thune amendment would force states with more restrictive standards to accept concealed carry permits from states with less stringent rules  in effect giving the lax rules national reach.

Passage of the amendment would make it much harder for law enforcement to distinguish between legal and illegal possession of a firearm. It would be a boon for illegal gun traffickers, making it easier to transport weapons across state lines without being caught.