If DACA or anything like it is included in any bill and is signed by Trump, then Trump and the Republican Party will lose all subsequent elections, regardless of anything else he or they might have done or may do from that point forward. Just like in Alabama with the Moore fiasco, the multitudes that made Trump’s election possible will never show up to vote again. Trump had better consider this and act accordingly.
Eliminating chain migration will cause many of the Dreamers to go home with their families. It has always seems clear to me that he would allow the Dreamers. I don’t believe he loses much support on this
That and you add all of those “dreamers” to the voting rolls.