The American Civil Liberties Union (ACLU) and two of its chapters are suing to halt President Trump's attempt to expand "fast-track" deportations without a full hearing. Why it matters: The lawsuit filed Wednesday in U.

Put simply, under Trump’s order, the children of most undocumented immigrants wouldn’t be US citizens, nor would the children of people in the country on student, work, or tourist visas. This is more than a reinterpretation of the 14th Amendment — it’s an attempt to do away with the jus soli principle that undergirds US citizenship.

Eighteen states and the ACLU filed lawsuits seeking to prevent President Trump from denying citizenship to children born in the U.S. to non-citizens.