And he's learning on the job.  He also heads the Republican Party, and in a Pew Research Poll taken in December 2015 re the "Gang of 8" Immigration Reform plan that gave them a legal way to stay, it was supported by 75% of Democrats, 72% of Independents, and 62% of Republicans.

If he kills DACA, he'll pay at the polls.  As Niki Haley said, "That's not who we are."  He won't be running against Hillary next time.  He may have been the only GOP candidate that Hillary had a chance of beating.

I voted for him for his stances on taxes, regulations, and trade deals, but I think he's dead wrong on how we treat the illegals from Mexico, most of whom have been here more than ten years without committing any serious crimes.  They came here because we let them with lax enforcement.  The downside risk of coming illegally was far less than the upside potential, and coming here legally required a 20 yr wait time.