History has shown that societal trust and political unity are threatened when foreign citizens are imported en-masse into a country ...
Yup, these guys are definitely referencing the Magna Carta with "Anglo-Saxon political traditions" and are not just generically racist.
Has it occurred to you that some people oppose immigration because they really do believe things they genuinely care about are threatened by it?
How about making the argument that the political traditions that America inherited from England and built upon is not threatened by large numbers of people coming here from completely different cultures, rather than assuming that caring about the political traditions at all is racist?
I should also point out that less than 10% of Americans are primarily of English descent, so if immigration from other countries harms those traditions, it would have finished us off centuries ago.
Those numbers are almost certainly underreported, but it’s certainly a minority of the country anyways.