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
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