The "CNN Republican Debate" is where Republican presidential candidates debate the issues live from Las Vegas, Nevada. The undercard Republican debate begins at 6 p.m. ET, with the prime-time GOP debate following at 8:30 p.m. ET. Your host for the evening is CNN Politics reporter Tal Kopan, who will also be bringing you insights from the whole CNN political team, both in Las Vegas and in Washington, D.C.