The Trump administration asked the Supreme Court on Thursday to allow a ban on birthright citizenship in about half of the country for children born to undocumented immigrants and foreign visitors.

The Trump administration is pushing for the the U.S. Supreme Court to allow some restrictions on birthright citizenship even as legal battles continue over President Donald Trump’s orders to end what has long been seen as a constitutional promise.

President Donald Trump’s administration asked the Supreme Court in a series of emergency appeals Thursday to allow him to move forward with plans to end birthright citizenship, elevating a fringe legal theory that several lower courts have resoundingly rejected.