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A Harvard professor is defending Donald Trump's plan for "extreme vetting" of immigrants in the face of an outcry from the left.

Writing in Politico Magazine, George J. Borjas, a labor economist who teaches at Harvard's John F. Kennedy School of Government, noted that one columnist called the proposed "ideological" screening "crazier than crazy" while an MSNBC commentator slammed it as "the single most un-American thing I have ever heard in my life."

But Borjas pointed out that what Trump is calling for has a long history in the U.S., referring to it as being "as American as apple pie."

"If all those pundits had bothered to do just a couple of minutes of googling before reacting, they would have discovered that immigrant vetting, and even extreme immigrant vetting, has a very long tradition in American history," wrote Borjas.

He pointed out that one of the nation's Founding Fathers, Alexander Hamilton, even warned against a Trojan horse-type situation when it came to "incorporating a large number of foreigners into [the] national mass."

"To admit foreigners indiscriminately to the rights of citizens, the moment they put foot in our country … would be nothing less, than to admit the Grecian Horse into the Citadel of our Liberty and Sovereignty," Hamilton wrote.

Trump has said numerous times during his campaign that allowing male refugees in from Syria could be a "Trojan horse" plot by ISIS to infiltrate the U.S.

Borjas concluded:

So, regardless of what you think about the Trump candidacy, the next time you hear that Trump’s proposal for immigrant vetting is un-American, the correct response is that it is American to its core. And the next time you hear that Trump’s proposal is crazier than crazy, the correct response is that—given the mess the world is in—it is the notion that we should not vet immigrants more carefully that is certifiably insane.

Read his piece in full, here.

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