The Supreme Court will hear arguments Thursday about President Donald Trump’s plan to end birthright citizenship and significantly limit the power of federal courts to slow his agenda – a case that has been rushed onto the high court’s docket less than four months after he returned to the White House.

The arguments hinged on a procedural question about the powers of lower courts that conservatives appeared sympathetic to, but that could create a patchwork of citizenship across the country.

The Supreme Court heard arguments about injunctions against Trump’s order to end birthright citizenship for those born to parents of undocumented immigrants or foreign visitors.