The U.S. Supreme Court’s decision limiting federal judges from issuing nationwide injunctions threatens to upend numerous lawsuits that have led to orders blocking Trump administration policies.

The ruling keeps President Donald Trump’s citizenship ban on hold for at least 30 days and sends cases back to the lower courts to determine next steps.

The U.S. Supreme Court handed President Donald Trump a major victory on Friday by curbing the power of federal judges to impose nationwide rulings impeding his policies but it left unresolved the issue of whether he can limit birthright citizenship.