President Donald Trump has vowed to " permanently pause migration" to the United States from "Third World" countries in the wake of the shooting of two National Guard members in Washington , D.C.

While it was not clear exactly which nations the President was referring to when he made the comments late Thursday , the US Citizenship and Immigration Services ( USCIS ) has indicated it will be reviewing green cards of people who have immigrated to the U.S. from 19 countries.

When asked which nations would have their citizens’ green cards re-examined , the USCIS pointed to a June proclamation signed by Trump that included Haiti, Iran, Libya, and Afghanistan .

Newsweek contacted the USCIS and the White House via email outside of regular working hours for further comme

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