Several states are suing the Trump administration to block it from terminating the program protecting young immigrants known as DREAMers.
The lawsuit, filed Wednesday in the Eastern District of New York, was brought by the attorneys general of 15 states and the District of Columbia. All are Democrats.
It follows the administration's announcement Tuesday that it would phase out the Obama-era program called Deferred Action for Childhood Arrivals, or DACA. U.S. Attorney General Jeff Sessions said DACA would end in March 2018 unless Congress takes action to salvage it.