Normally, I would agree with you. 
But, I think that T is opposing the GOPs at this time. He is as likely to work with the dems as he is with GOPs. And I would guess that if Ds and T come to some decent agreement that is all encompassing, that plenty of GOPers will come over. 
BUT, Im guessing that it will have to address most, if not all, of the main issues. 

The one that I really think MUST be in there, is a phase-in of e-verify with real penalties for business (and ideally the ppl that hired/hide the future illegal), followed with going after the Sanctuary cities. For now, it is a waste of time to hit sanctuary govs (including CA), until e-verify has been fully phased in. Also need to require that ANY current illegal that is legalized, that hides an illegal, will be deported or jailed. 
Once that is done and the majority of illegal have left, then go after santuary govs and gangs. They will be much easier to spot.