People from Syria, Iran, Sudan, Libya, Somalia, Yemen and Iraq have been banned from entering the US during the next 90 days
Arabs and Iranians planning US trips have been hit by travel curbs, with many stopped from boarding flights since President Trump's order on "extreme vetting" was signed.
Here’s a look at what’s included in the new measures:
• The order bars the entry of foreign nationals from certain countries for 90 days. While no countries are specifically named in the order, it refers to a statute that would apply to seven Muslim-majority nations: Syria, Iran, Sudan, Libya, Somalia, Yemen and Iraq.
• There is an exception for certain types of visas, including for diplomats and the United Nations. The temporary halt is aimed at giving the Department of Homeland Security, the State Department and the Director of National Intelligence time to determine what information is needed from each country to ensure that visas are not issued to individuals posing a national security threat.
• The order calls for a review to create a single process for screening people entering the country, which could include holding more in-person interviews, searches of an expanded database of identity documents or longer application forms.
• The order suspends the Visa Interview Waiver Program, which allows consular officers to exempt some applicants from face-to-face interviews if they are seeking to renew their temporary visas within a year of expiration.
• The order calls for the temporary halt of all refugee admissions for four months so the government can study the process and determine if additional checks are necessary, although there will be case-by-case exceptions.
• The order also implemented a blanket ban of all Syrian refugees until "sufficient changes" have been made to the refugee program, without giving more details.
• After the suspension is lifted, the government will give priority to applicants that are suffering religious-based prosecution, but only if they are minorities in their country. Once refugee admissions resume, fewer will be allowed. The 2017 cap was set at 50,000 people, compared to 85,000 designated by President Obama for 2016.
• The system is aimed at tracking foreign visitors' arrival and departure using information like finger prints. Former President Barack Obama's administration had aimed to start implementing biometric exit checks at the country's largest airports by 2018.