Debate exposes Rubio-Cruz divide, elevates Christie profile

LAS VEGAS – The fifth Republican presidential debate of the 2016 election cycle, which on Tuesday drew roughly 18 million viewers to cable news giant CNN, promised to be a showdown on national security and remained true to its billing.
The night's most memorable moment, however, came as two senators, Ted Cruz of Texas and Florida's Marco Rubio, squared off over a bill that limited some government surveillance methods that had been used under the 2001 USA Patriot Act.