Opposition to illegal immigration and Obamacare is what got Trump elected, this everyone knows, so if he accepts the DACA people as citizens, it will sour his base to abandon him for another to run in the 2020 primaries against Trump. The midterm elections in 2018 bode well for the Tea Party types, even better if Trump goes wobbly on DACA, so working with the Democrats on DACA would gain him a few glowing headlines in the near term but would cost him his legacy, branded all talk and no action.
