The US Supreme Court today will hear a major constitutional case about birthright citizenship. We shouldn’t be debating this right now. But since the president chose to act with such striking disregard for the law, here we are.

Birthright citizenship is in the Constitution. The first sentence of the 14th Amendment reads, “All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside.”

This has been the law for more than 150 years. The amendment overturned the notorious Dred Scott decision, which said that even free Black Americans could not be U.S. citizens. The Supreme Court in 1898 confirmed the 14th Amendment’s plain meaning. In United States v. Wong Kim Ark, it ruled that children born here are citizens, even if their parents are not. That principle gave rise to generations of new Americans.

Donald Trump tried to Sharpie this out of the Constitution. A few hours after he took office, he signed an executive order purporting to deny citizenship to the children born here to non-U.S. citizens. Courts immediately ruled against the White House. Last summer, the Supreme Court stopped individual judges from issuing such nationwide orders, but it left open the possibility of class action lawsuits. Hence Trump v. Barbara, brought by the American Civil Liberties Union.

This is open and shut. Con law for dummies.

Grasping for arguments, Trump’s lawyers landed on this: The 14th Amendment’s “one pervading purpose” was to protect the children of former slaves, not anyone else. That reading puts aside the clear language of the amendment, along with a century and a half of history and tradition. It’s historical fan fiction, designed to appeal to an “originalist” Court.

Historians Martha Jones and Kate Masur, a member of the Brennan Center’s Historians Council, corrected the record in a key amicus brief. “When the Framers wrote birthright citizenship into the Constitution, they were not addressing only the status of former slaves,” they explained. “They were also remedying the eight decades of injustice imposed upon free people born in the United States, among them free Black Americans, including those who had never been enslaved.” What’s more, the historians note, “The Framers well understood that the Amendment’s broad terms would recognize and protect the citizenship status of the children of immigrants.”

One echo throughout history: We’ve seen the arguments against birthright citizenship before, and they were born of nativism and made by racists. In our Countering Originalism........

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