Remember this: There is a huge majority in both houses of Congress in favor of this DACA amnesty, but voters are overwhelmingly either: (1) opposed to it, or (2) outraged that Congress even dedicates any energy to dealing with these DACA immigrants at all.
Item (2) is the single biggest reason why the GOP-led Congress had let the DACA issue vanish from their agenda entirely.
If they pass this over Trump’s veto, Trump will cruise to re-election.
He will have proven himself to be the only person in D.C. willing to do the right thing.
The GOP would enter a state of full-on civil war.