Undocumented migrants march to US Supreme Court Undocumented migrants march to the US Supreme Court ahead of a key decision on the Deferred Action for Childhood Arrivals (DACA) program, with some walking from Philadelphia and New York. An estimated 600,000 "Dreamers", many of whom have never lived anywhere else, were allowed to stay and work in the United States under this program, until President Donald Trump ended it in 2017. Their case has been tangled up in the courts since then.