The Declaration of Independence famously proclaims that "all men are created equal". It doesn't say "people born in the United States have more rights than other people".
This has always been a nation of immigrants. People born in other parts of the world have contributed their energy and culture to make America what it is today. Almost everyone living here now is either an immigrant or a descendant of immigrants.
Most politicans today are uncomfortable with immigration. They don't all talk about it using the same language, but they all agree that it needs to be controlled. They have forgotten that bold claim "created equal" that was such a central feature of the document on which this country was founded.
They have also forgotten the basic idea of democracy, a principle that many of them claim to consider more important even than liberty – that it should be the people living in a geographic area who get to decide who governns them, and how. Allowing the government to decide who can live where is turning that idea on its head! And the government has not, in fact, managed to prevent immigration – what it has done, instead, is brand a large number of human beings as "illegal" or "undocumented", without the rights of the rest of the population, against whom discrimination is not only legal but required. No democracy can survive with such a large and growing population of disenfranchised subjects.
As a Libertarian, I respect the rights of all people, no matter where they were born. The right to move about and seek a better life for oneself and one's family is a fundamental right. I look forward to a day when all the present restrictions are gone. I don't expect that to happen immediately, but it should be our goal.
In the meantime, I support the following common-sense reforms: