In Europe in the early twentieth century nationalism did carry conspicuous anti-Semitic strains but except for the Russian far Right those strains don’t seem to be integral to most European nationalisms today. But as Jews overreact to these forms of reawakened nationalism, and even line up on the side of Islamicist immigrants against the native population, nationalist movements of the Right may move again for understandable reasons in an anti-Jewish direction.
Interview with Paul Gottfried
I'd been wondering about this, but it's sensible: nationalism excludes all except the native born, but as those lines have been eroded, it's now a more open camp. Jews who turn against it (a) risk repeating history and (b) act against their own interests, as Islam makes clear its position on Jews.