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 is hearing arguments Thursday morning about the power of lower courts to issue nationwide injunctions, including rulings that have blocked President Donald Trump’s executive order restricting the guarantee of birthright citizenship nationwide.

A majority of the Supreme Court appeared ready Thursday to place some limits on the power of single federal district judges to freeze presidential actions nationwide, in oral arguments over the future of President Donald Trump’s effort to end birthright citizenship.