The Supreme Court will hear oral arguments on President Trump’s executive order ending automatic citizenship for babies born in the US|Marielam1|CC BY-SA 4.0

The Supreme Court Justices will hear a case today challenging President Donald Trump’s January executive order that limited birthright citizenship.

The order sought to deny citizenship to US-born children unless at least one parent is a citizen or a lawful permanent resident. It challenged the 14th Amendment, which states that 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.”

The Trump administration contends it doesn’t apply to illegal or temporary immigrants.

Judges in Washington state, Massachusetts and Maryland blocked Trump’s order, stating it violates the US Constitution.

But now, Trump’s team is asking the 6–3 conservative majority Supreme Court not to focus on whether the rule is legal. Instead, they want the court to decide if federal judges can issue nationwide injunctions to block presidential policies.

If the court agrees, it could divide the US into states where infants are granted citizenship and others where they aren’t.