ALCU Deputy Director Lee Gelernt and Immigration Attorney Michelle Canero speak to NBC News' Tom Llamas about President Trump's executive order on challenging birthright citizenship and what this could mean for Americans.

A day after President Donald Trump issued an executive order barring birthright citizenship to children of undocumented residents, the American Civil Liberties Union of New Hampshire sued in the U.S.

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.