Ted Cruz attacks Rubio on immigration in new Iowa ad
Marco Rubio "betrayed our trust" by helping author the Gang of 8 immigration bill, Ted Cruz says in a new ad launched today in Iowa.
The attack -- going after Rubio's chief vulnerability in the race for the nomination -- is a sign of the threat Rubio poses to Cruz, who has been battling with Donald Trump. The ad is new but not the attack. Cruz has been hitting Rubio on immigration for a while. Rubio's response: Cruz supported legal status for immigrants and an expansion of work visas.