A president cannot amend the Constitution by himself, and a Trump order to end birthright citizenship would doubtless face lawsuits. During his first term, he promised to end birthright citizenship but took little action to do so.

Legal experts said the president’s executive order would upend precedent and is unlikely to pass constitutional muster

President Donald Trump began his term by taking a series of sweeping immigration executive actions Monday that included declaring a national emergency at the US southern border, immediately ending use of a border app called CBP One that had allowed migrants to legally enter the United States,