The Supreme Court on Thursday seemed open to lifting a series of nationwide orders blocking President Donald Trump from enforcing his birthright citizenship policy, even as several of the justices wrestled with the practical implications of allowing the government to deny citizenship to people born in the US.

The Supreme Court on Thursday signaled deep uncertainty over how, or whether, to rein in the growing use of nationwide injunctions, a legal tool that has repeatedly stymied President Donald Trump’s agenda.

The Supreme Court appeared ready Thursday to place some limits on the power of district judges to freeze presidential actions nationwide.