The Republicans are perfectly willing to let the country turn into a shambles waiting, Trump doesn't care as long a he feels like he is winning, and the Democrats are genuinely concerned with the state of the USA. It is just possible that some of the less-fascist Republicans will break, but it is more likely, I think, that the Democrats will; they have not been willing to fight for long years.
I hope the Democrats do stand fast. Mass deportations are, literally, something out of the Nazi past. Should the United States pursue such a policy, Homeland Security will be vastly expanded and will, once the deportations are done, turn to other atrocities.