Republicans are gathering in Las Vegas for the last GOP debate of 2015. We'll get analysis on the face-off and the candidates' positions on national security, a top concern for Americans after the deadly attacks in Paris and San Bernardino.
National Security Looms Large at Final 2015 Republican Debate
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Ron Elving, senior Washington editor, NPR News
Rebecca Sinderbrand, political news editor at the Washington Post
Emily Schultheis, politics reporter for National Journal
Jon Greenberg, national staff writer, Politifact