The US Senate is set to hold a vote on whether to debate gun-control legislation amid opposition by Republicans to the bill.
With the vote set to be held on Thursday, Senate Democratic Majority Leader Harry Reid said it was unclear supporters of the law could secure the 60 votes required to conquer a filibuster threatened by Republicans.
The pro-gun Republicans are backed by some US citizens who say the way to reduce crime is by pouring more guns into communities.
One gun activist in Arizona, is leading a campaign to arm residents living in high-crime areas with free shotguns and training.
Al Jazeera's Rob Reynolds reports from Tucson, Arizona.