President Donald Trump is resurrecting the travel ban policy from his first term, signing a proclamation Wednesday night preventing people from a dozen countries from entering the United States.

The travel ban results from a Jan. 20 executive order Trump issued requiring the departments of State and Homeland Security and the director of national intelligence to compile a report on “hostile attitudes” toward the U.S. and whether entry from certain countries represented a national security risk.

Trump framed the new restrictions, which primarily target African and Asian countries, as necessary to fortify national security and combat terrorism.