The US Supreme Court has agreed to hear a case on whether some children born in the US have a constitutional right to citizenship.On his first day in office in January, President Donald Trump signed an order to end birthright citizenship for those born to parents who are in the country illegally, but the move was blocked by multiple lower courts.No date has been set yet for the Supreme Court arguments, and a ruling is months away.Whatever the court decides could have major implications for Trump’s immigration crackdown and for what it means to be an American citizen.For nearly 160 years, the 14th Amendment of the US Constitution has established the principle that anyone born in the country is a US citizen, with exceptions for children born to diplomats and foreign military forces.The language of the amendment states: “All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States.”Trump’s executive order seeks to deny citizenship to the children of people who are either in the US illegally or are in the country on temporary visas. It is part of the Trump administration’s broader effort to reform the nation’s immigration system and combat what they have called “significant threats to national security and public safety”.The administration has argued the 14th Amendment clause “subject to the jurisdiction thereof” means the amendment excludes children of people who are not in the country permanently or lawfully.Cecillia Wang, national legal director of the American Civil Liberties Union, which is representing the plaintiffs in the case, told the BBC’s news partner CBS that no president can change the 14th Amendment’s fundamental promise of citizenship.”For over 150 years, it has been the law and our national tradition that everyone born on U.S. soil is a citizen from bir …