House Speaker Paul Ryan (R-Wis.) and other Republican leaders in Congress on Friday urged President Trump not to terminate an Obama-era program that has allowed nearly 800,000 undocumented immigrants known as “dreamers” to live and work in the country without fear of deportation.

Ryan said in a radio interview that it was up to Congress to determine the fate of the immigrants enrolled in Deferred Action for Childhood Arrivals, which offers two-year work permits to those who have been in the country illegally since they were children.