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The Supreme Court hears arguments on birthright citizenship. The outcome could redetermine who gets to be an American.

You have people who have been relying on this automatic birthright citizenship for over a century.

And so I think that there's always concern about how whatever they decide will play out in the real world.

Plus, SpaceX files for what could be the biggest IPO in history.

And NASA's planning to go where no one has gone before, or at least not since 1972.

It's Wednesday, April 1st.

I'm Alex Osloaf for the Wall Street Journal.

This is the PM edition of What's News, the top headlines and business stories

that move the world today. The Supreme Court heard arguments today on possible limits to

birthright citizenship in the U.S. As expected, President Trump sat in on part of the hearing,

the first known example of a sitting president to attend arguments before the Supreme Court.

On the first day of his second term, Trump signed an executive order that would end automatic birthright citizenship for babies born to unauthorized immigrants or people living here temporarily.

At least six courts have already said the order violates the 14th Amendment.

WSJ legal affairs reporter Lydia Wheeler joins me now from Washington.

Lydia, what was the Trump administration's argument here?

So the Trump administration is arguing that the Citizenship Clause of the 14th Amendment

...