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This week: The Paris attacks put national security, immigration — even how we talk about tragedy on Facebook — in the spotlight. Plus what the NPR Politics team just 'can't let go' this week. This episode: Tamara Keith, White House correspondent; Ron Elving, editor and correspondent, Scott Detrow, political and technology reporter, and Sam Sanders, campaign reporter. Find the team on Twitter @nprpolitics and at npr.org/politics.