Tennessee Rep. Jim Cooper (D) called for limited access to “military-grade assault weapons” after a gunman reportedly opened fire at a Waffle House near Nashville, Tenn., killing four people. “Nashville woke up to devastating news. We mourn the innocent victims and thank our brave first responders. Many will say now is not the time to discuss change. But now IS the time,” Cooper, who represents Tennessee’s fifth district, wrote on Twitter. “We can and must do everything possible to prevent these tragedies and keep Americans safe," he tweeted. "That starts with restricting widespread civilian access to military-grade assault weapons.” Dem...