Birthright citizenship — the idea that every person born in the U.S. is an American citizen — is spelled out in the 14th Amendment to the Constitution.

Washington state is suing the Trump administration over the president's executive order to end birthright citizenship, with Arizona, Oregon, and Illinois joining the lawsuit. Why it matters: The legal challenge,

Washington’s attorney general plans to sue the Trump administration Tuesday over the president’s executive order seeking to end birthright citizenship. Attorney General Nick Brown’s lawsuit comes just 24 hours after President Donald Trump took office for a second time Monday.