Rubio has already stated he won't do anything meaningful about illegal immigration.
On the other hand, Cruz appears more committed to following through on deportation of illegals than does Trump -- who has admitted he favors 'touchback' deportation.
Sounds good...but I expect the best that Cruz could accomplish is to increase the border control, no fence would be built and we get rid of some of the violent illegals. That's about all Cruz could accomplish.