The study in the OP makes clear that Bernie Sander is just wrong when he blames immigrants from coming to take away benefits from American workers. This is just wrong. To the contrary, immigration has helped to fund social security because immigrant communities tend to be younger, which helps generate a tax base to fund social security.
Instead of acknowledging this, Bernie has continued to scapegoat immigrants even during the current election cycle.
https://www.newsweek.com/bernie-sanders-open-borders-poverty-world-immigration-1388767
Senator Bernie Sanders pushed back to clarify his position on immigration on Sunday after he was asked in Iowa about his reported support for open borders.
"I'm afraid you may be getting your information wrong," said Sanders, an independent from Vermont who is currently seeking the Democratic nomination to unseat President Donald Trump in 2020, The Washington Post reported. "I think what we need is comprehensive immigration reform," he said.
"Oh my god, there's a lot of poverty in this world, and you're going to have people from all over the world. And I don't think that's something that we can do at this point. Can't do it," the senator added.
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Some immigration advocates and progressives have pushed for open borders, however, and many were quick to criticize Sanders's response on social media. Many said he sounded like Trump on immigration, while others argued that the U.S., as a wealthy nation, should show more concern about the plight of migrants.