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After a gunman killed 12 people at the Washington Navy Yard in the country’s most deadly mass shooting since the Newtown, Connecticut tragedy, some lawmakers are renewing the debate over gun control legislation. Chairman of “Stop Handgun Violence” John Rosenthal, NBC’s Kasie Hunt, and Sirius XM’s Michael Smerconish join NewsNation’s Tamron Hall to discuss whether this new push has the potential to change the conversation.Sep.17.2013