Considering that you support Trump, your concern over campaign trail conversions is nothing short of ironic to a comedic degree.
You have no doubt Trump would enforce the laws...based on what? His liberal past? The things he says that make you feel good?
On the other hand, Cruz has talked the talk and walked the walk.
No Cruz has only been in the Senate for 2 years hardly enough time to "walk the walk" and he only recently started talking the talk. Up until now Cruz avoided the topic of enforcing immigration laws and deporting illegals. I think there is a good chance Cruz is just saying this because he sees first hand how well trump is doing on this issue.
Cruz is a lawyer and he is a very good lawyer, I don't like lawyers, I don't trust lawyers and I think lots of lawyers have no problem lying.