Moreover, up until recently the United States also saw itself as a nation, not as an employment agency for the rest of the world. Immigrants had to become Americans. That is what public education used to be about. One lazy assumption follows another. But then it doesn't matter whether Europeans agree with him or not.
Immigrants are here to stay, and more are on the way.
Cohen typically never attempts to make the case that economic growth is contingent on high levels of immigration. Clearly there are economic benefits to immigration. On the other hand, there are also costs. But he may well be a net cost if his family needs medical treatment and his children go to school. He will help drive wages down and housing rents up.