Kevin D. Williamson wrote a piece for the print edition of National Review published July 6 that has now been adapted for the on-line version. I won't link it; it's not hard to find for anyone for whom head-banging doesn't provide enough stimulation:
In the Bernieverse, there’s a whole lot of nationalism mixed up in the socialism. He is, in fact, leading a national-socialist movement, which is a queasy and uncomfortable thing to write about a man who is the son of Jewish immigrants from Poland and whose family was murdered in the Holocaust. But there is no other way to characterize his views and his politics. The incessant reliance on xenophobic (and largely untrue) tropes holding that the current economic woes of the United States are the result of scheming foreigners, especially the wicked Chinese, “stealing our jobs” and victimizing his class allies is nothing more than an updated version of Kaiser Wilhelm II’s “yellow peril” rhetoric, and though the kaiser had a more poetical imagination — he said he had a vision of the Buddha riding a dragon across Europe, laying waste to all — Bernie’s take is substantially similar. He describes the normalization of trade relations with China as “catastrophic” — Sanders and Jesse Helms both voted against the Clinton-backed China-trade legislation — and heaps scorn on every other trade-liberalization pact. That economic interactions with foreigners are inherently hurtful and exploitative is central to his view of how the world works. [...]
Sanders doesn’t rail about the Canadians and Germans stealing our jobs — his ire is reserved almost exclusively for the Chinese and the Latin Americans, as when he demanded of Herself, in the words of the old protest song, “Which side are you on?” The bad guys, or American workers “seeing their jobs go to China or Mexico?” But for the emerging national socialist, dusky people abroad are not the only problem.