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WASHINGTON — The US Supreme Court was weighing Donald Trump's historic bid to end birthright citizenship on Wednesday, with the Republican president smashing protocol by sitting in the audience.
The birthright case is a pillar in Trump's attempts to restrict immigration, and his decision to attend oral arguments is unprecedented for a sitting president.
Trump signed an executive order on his return to the White House, decreeing that children born to parents in the United States illegally or on temporary visas would not automatically become US citizens.
Lower courts blocked the move as unconstitutional, ruling that under the Citizenship Clause of the 14th Amendment, nearly everyone born on US soil is an American citizen.
Solicitor General John Sauer, in his opening remarks to the court on Wednesday, said, "unrestricted birthright citizenship contradicts the practice of the overwhelming majority of modern nations.
"It demeans the priceless and profound gift of American citizenship," Sauer said.
"It operates as a powerful pull factor for illegal immigration and rewards illegal aliens who not only violate the immigration laws but also jump in front of those who follow the rules."
And Steven Schwinn, a law professor at the University of Illinois Chicago, said the court is likely to reject the challenge to birthright citizenship.
"This is a court that has looked to history and tradition as a significant guide in understanding the Constitution," Schwinn told AFP. "And it would be a little surprising if, after 150 years, we suddenly discovered we were applying the Citizenship Clause all wrong."
Conservatives have a 6-3 supermajority on the high court, and three of the justices were appointed by Trump.
Sauer, in a brief with the court, said that in order to be eligible for citizenship, "a person must be both born 'in the United States' and 'subject to the jurisdiction thereof.'"
"Children of temporarily present aliens or illegal aliens are not 'subject to' the United States' 'jurisdiction,'" Sauer said.
The American Civil Liberties Union, which is defending birthright citizenship before the court, said the Trump administration "is asking for nothing less than a remaking of our Nation's constitutional foundations."
If the Supreme Court does reject ending birthright citizenship, it would be the second major loss for Trump this term, the justices struck down most of his global tariffs in February.
A decision in the case is expected by late June or early July.