(CNN) — The US will reexamine all green cards issued to people from 19 countries “of concern” at President Donald Trump’s direction, as the Trump administration intensifies its immigration crackdown following the shooting of two National Guard members in Washington, DC.

“At the direction of @POTUS, I have directed a full scale, rigorous reexamination of every Green Card for every alien from every country of concern,” Joe Edlow, the director of US Citizenship and Immigration Services, wrote in a post on X Thursday.

Asked for additional details, including which countries are considered to be “of concern,” USCIS pointed CNN to 19 countries listed in a June presidential proclamation .

The 19 countries include Afghanistan, Burma, Chad, Republic of the Congo, Equatorial Guinea, Eritrea

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