I'm not sure traditional/sane republicans recognize that in the short term their base is not going to accept immigration. There will never be a coming to Jesus moment where they say "wow we lost another election. It's time to change our tone at least, and slowly move to the center on policy over the next couple years."
Borders. Language. Culture.
Illegal immigration aka unwanted immigration is literally an invasion by people who are going to not just overrun the borders but the language and the culture. They're going to come here and establish the same hellhole socialist society they left while the government makes Real American Citizens helpless to stop a literal covert invasion of the country.
This is literally a fight to save America and everything she stands for. And the government doesn't just intend to surrender without a fight, it wants to pay tribute to and suppress the citizenry for the conquerors.
As the former President of MIT has said:
He argued that the “indiscriminate hospitality” to more whose homes would be “filled by others as miserable as themselves” would not make up for any “permanent injury done to our republic,” and that with the success of the American “experiment” more would be done for the [home nations] than “allowing its city slums and its vast stagnant reservoirs of degraded peasantry to be drained off upon our soil.”
And Representative Johnson warns:
in a few years down the road without further restriction the currently despairing immigrants “will be pounding heavily at the very pillars of our government, where those who have come ahead of them a few years back with their socialism, their communism, their [revolutions], have merely gnawing like rats at our foundations.”
Representative Box of Texas has outlined our future:
if America destroyed the “work of our fathers” and became “another Europe or Asia” leaving a world that would “grow visibly darker, even to the people of foreign lands, and all that is worth living for will have been lost to us, whether we came recently or our fathers came long ago.”
Senator Heflin pointed out that in past wars we went:
“across the seas to defeat a foreign foe and prevent a foreign army from invading America” the current immigration laws were allowing “the enemy through loopholes … to come right into the American household.” Heflin asserted that if American troops had “fought to keep the enemy out, surely we can vote for a law that will keep out the dangerous and deadly enemies of the country
Republican Congressman Cable of Ohio:
called for the two parties to “unite in forming an ‘American bloc’ and that neither yield to the foreign influence,” declaring that “partisan politics have no place in this patriotic question.”
He also noted that in certain cities, illegal immigrants were being favored by local policy:
eighty percent of the city’s population was “foreign-stock” and that the vote displayed “the effect of the foreign born in the United States in attempting to dictate to Congress what laws should [be made].”
Representative Box was on point when he argued this isn't discrimination, instead that:
“America has the gift of citizenship, home and opportunity to bestow as she chooses upon the worthy alien people who she many select, no Government and no group … has the right to question the exercise of America’s discretion in making such a choice.”
He also pointed out of that many of these illegal immigrant groups are basically making the equivalent of a threat that:
“we already have admitted among us large, dangerous elements, and that we must admit more of them to keep them in a good and orderly humor.”
While Republican Bill Vaile has knocked down all the hooey about how important immigrants are to America:
“it seems rather illogical … to claim that those who have been for the shortest time in the process of assimilation and in the work of the Republic should have even greater or even equal consideration because of this very newness.” And that it was “a fact, not merely an argument, that this country was created, kept united and developed … almost entirely by people who came here from the countries of Northern and Western Europe.”
But it's Democrat Stengle of New York who might best sum up the importance of borders, language, culture:
“many of the inhabitants of these cities appear to be tied up to foreign countries by their sympathies, customs, interests, and aspirations, and apparently but little interested in the future welfare of their adopted country.”