watching see me pull a gun out thinks, second shooter. and in arizona where people keep guns in their cars, somebody could have shot me. >> reporter: thelma gutierrez, cnn, tucson, arizona. the suspect in the arizona mass shooting allegedly used an extended magazine in his gun to shoot 19 people before having to reload. many gun control advocates don't see any reason for these high-capacity magazines to exist. and next week, new york congresswoman carolyn mccarthy plans to introduce a bill that would ban those high-capacity magazines. this is a very personal mission for mccarthy who became a congresswoman after a gun tragedy hit her family back in 1993. i asked her what exactly her new bill would do in tonight's "what matters". >> basically it would go back to reinstate the 1994 -- the 204 ban on high-capacity