Investigators probe how a Louisiana gunman who killed eight children got his weapon despite an illegal firearms conviction. Negotiations between the U.S. and Iran are uncertain as a ceasefire deadline looms. And Virginians will vote whether to allow a Democrat-drawn congressional map to be used in the midterm elections — it could net them up to four seats. Here’s what to know today. Investigators are looking into how Shamar Elkins, a former National Guardsman identified as the gunman who killed