The US is resuming admissions of refugees from 11 countries that were previously identified as high security risks. Additional layers of screening will be added to the process. The countries are mostly in the Middle East and Africa. Details about which people will be subject to screening were not revealed. The new rules are the latest changes made by the Trump administration to address national security issues. Some of its previous actions, including an executive order to temporarily ban all refugees, have sparked controversy and lengthy court battles.