What makes a U.S. citizen? An executive order signed by President Trump aims to end a 127-year-old precedent clarifying universal birthright citizenship.

Instead, the president is aiming to fulfill a campaign promise to limit citizenship at birth to people with at least one parent who is a permanent resident or U.S. citizen.

That order is on hold until a court hearing on Thursday.

Stephanie Sye reports now on how the history and the legacy of birthright citizenship.

Bowes anyone?

Over pork buns and tea, the Wong family welcomed the Lunar New Year with what they see as unwelcome news.

I won't say it wasn't a surprise, but, you know, it happened so quickly.

It's frightening, actually.

Birthright, that's a big one.

President Trump's attack on birthright citizenship hits home for Norman Wong and his sister, Sandra.

I'm proud of what my great-grandfather, Wong Kim Ark, did because he stood up.

It was their late relative, Wong Kim Ark, whose fight for birthright citizenship led to a pivotal

1898 Supreme Court case.

Law professor Amanda Frost details Wang Kim Arc's story in her book, You Are Not American.

He was born in the United States and the government, they argued that he was not, in fact,

a citizen of the United States.

Wong Kim Ark was born in San Francisco's Chinatown in the early 1870s.

His parents were merchants who were living in the country legally.

As a result of the 14th Amendment to the Constitution ratified just a few years earlier,

he was by virtue of birth an American citizen.

The first sentence of the 14th Amendment provides that all persons born are natural He was by virtue of birth an American citizen.

The first sentence of the 14th Amendment provides that all persons born are naturalized in the United States and subject to the jurisdiction thereof are citizens of the United States.

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