Trump has threatened to strip some Americans’ citizenship, which many countries allow in the name of security but critics say can lead to weaponization.

Trump’s executive order, signed in January, seeks to deny citizenship to children who are born to people who are living in the U.S. illegally or temporarily. It is part of the hard-line immigration agenda of the president, who has called birthright citizenship a “magnet for illegal immigration.”

The legal fight over President Trump’s order ending birthright citizenship is advancing on a path toward the Supreme Court after a New Hampshire federal judge blocked the president's order on Thursday.