Local officials point to a .50-caliber assault weapon during a 2005 news conference in Chicago, a year before Cook County officials enacted an assault weapons ban. The law has been upheld by trial and appeals courts. On Thursday, a federal appeals court again kept the law in place.
M. Spencer Green/AP
Republican Rep. Mike Turner represents Dayton, Ohio, where a mass shooting occurred over the weekend. He opposed a House bill expanding background checks but came out in favor of measures to ban assault-style weapons and proposals for red-flag bills.