The most impotant thing to establishment Repubilcan is protetcting their 30 year bipartisan policy of non-enforcement of immigration laws.
The illegal alien inundation was intentional and the Bush family are largely responsible.
I have stood on the Texas side myself and watched them wade across carrying their bundles on their heads. That was about 30 years ago. My husband happened on a Mexican woman laying under a bush on the ground, she had just given birth. By the time the Border Guards got there she and the baby were gone. My husband found a human skull in his hunting pasture. That's one who didn't make it very far.
But this is all a Bush's fault.
I think many administrations are to blame. Maybe Trump will fix it but I have my doubts.