Tell you where I am on this. My experience is that Kudlow is a capable economist who is right a good fraction of the time. He is off on this one, like a number of people, because he has a mistaken understanding of the costs and benefits of illegal immigration. Like many, he sees the benefits and discounts the costs. For those of us who live outside the beltway, we see what has happened to our schools, hospitals and prisons - they have been beggared by illegals. A few people make money off the illegals, and they are powerful and politically connected (farmers, businessmen and (!) teachers). The rest of us have to pay what their employers do not pay for (medical costs, dumbed down education for our kids, the cost of uninusured drivers, etc.).
My own take is Lawrence Kudlow is at least 50% libertarian and is the kind of libertarian who trends toward open borders and unlimited "free trade". He is putting free markets above US sovereignty and cultural cohesiveness. In the circles he moves I doubt there is much anguish over illegal immigration. That's for the little people who just coincidentally fight wars and die for America
Kudlow ain't too bad. I just realize his limitations.
Mike Pence is a snake. I have only contempt for him. He is squishy soft on other matters too.