gun control debate reigniting after walmart announces it will stop selling handguns and certain ammunition in the wake of the shooting. chicago s democratic mayor saying that city s gun violence problem is in a republican-led state. kristin fisher tracking those threats. reporter: we heard about the latest mass shooting in texas but in chicago twee 7 people were killed and 34 wounded in 29 separate incidents in one weekend. it got the attention of ted cruz who is in a heated dispute with the democratic mayor. as pressure mounts on congress to pass a form of gun-control ted cruz said it doesn t work. look at chicago, disturbing law-abiding citizens is not the answer. this profit a quick response from chicago s mayor who fired