Ten years ago, the Obama administration established the Deferred Action for Childhood Arrivals (DACA) policy to shield unauthorized immigrants brought to the U.S. as minors from deportation if they met certain requirements, including arriving in the country by age 16 and before June 2007, studying in a U.S. school or serving in the military and lacking any serious criminal record. A federal court later this year could shut down the DACA program.