A federal judge in New Hampshire will hear arguments Thursday on whether to certify a class-action lawsuit that would include every baby affected by President Donald Trump’s restrictions on birthright citizenship. The lawsuit, filed on behalf of a pregnant woman, two parents and their infants, is among numerous cases challenging Trump’s January order denying citizenship to those born to parents living in the U.S. illegally or temporarily. Represented by the American Civil Liberties Union and others, the plaintiffs are seeking to have their case certified as a class action and to block implementation of the order while litigation continues.