One of the many executive orders President Donald Trump signed on Monday included one to end birthright citizenship. Here's what to know about it and why lawsuits have already been filed.

This piece was updated 01/21/2025. The American Civil Liberties Union and immigrants rights advocates sued the Trump administration on its first day in office after President Trump signed an executive order that seeks to strip certain babies born in the U.S. of the United States citizenship that the Constitution guarantees to them.