Republican presidential contender Mitt Romney is hammering away at rival Rick Perry on immigration again – this time in a new web ad that seeks to portray the Texas governor as having views that serve Mexico’s interests.

Romney's latest ad features former Mexico President Vicente Fox thanking Perry for a Texas law that allows undocumented immigrants to attend public colleges at in-state tuition rates.


The ad shows Fox saying: “I want to publicly recognize Gov. Perry and the state of Texas by having taken that step forward when you decided to give access to Mexican migrants to universities In Texas.â€