In short, SCOTUS told federal district judges that they could still block Trump's birthright citizenship order from going into effect nationwide if they followed "proper legal procedures" in a national class action case. That is what Laplante did in this case. He blocked Trump's order in a well-reasoned ruling that was well-grounded in Rule 23.

Class actions let people facing a common problem band together in a single lawsuit to obtain nationwide relief.

A federal judge in New Hampshire has blocked President Donald Trump’s executive order ending birthright citizenship.