No American citizen, in the history of this country, has ever voted for mass immigration. It was foisted upon us by politicians that wanted to either virtue signal, or get cheap labor.
If you explicitiy ask anyone if they want to import millions of people or have open borders, it will be explicitly rejected by the vast majority, yet somehow we still got it.
No one is disputing that a nation has the sovereign right to determine its own immigration policies, and to protect its borders. But this nation was built on immigration; you yourself are probably the descendant of immigrants. It is rational to support immigration that spurs economic growth and, in appropriate situations, permits asylum seekers to find a home in this generous and prosperous nation.
We will see if the extreme nativism and implicit racism of Trump's rejection of traditional immigration policy carries the day. It is, to be sure, very different than the GOP of my day, which saw immigration as a net benefit. We are a sovereign nation and we can choose to be welcoming or choose to close our borders and hunker down against the rest of the world.
Note that the foregoing has nothing to do with the question of ILLEGAL immigration. We can all agree that the law must be enforced, and rules followed. But there are sound reasons to encourage more legal immigration; our economy will grind to a halt without it. As for asylum, that is a question of our humanity. I advocate a generous policy that is not an open door, but recognizes that our policies (e.g., our inability to curb demand for illegal drugs that has created the market satisfied by violent gangs) have created real victims in some parts of the world.