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.

The Trump administration asked the Supreme Court to stop appeals court rulings that blocked Trump’s order to end birthright citizenship, which would deny U.S. citizenship to children born in the U.S. if their parents are undocumented or on temporary visas.