U.S. President Donald Trump announced Thursday that his administration will “permanently pause” migration from all “Third World Countries,” following an attack near the White House that left a National Guard member dead. The attack, carried out by an Afghan immigrant, has intensified Trump’s push for stricter immigration controls.

Speaking on his social media platform Truth Social, Trump linked the incident to alleged failures in Biden-era immigration vetting. He said the migration freeze would include cases approved under former President Joe Biden and that his administration plans to terminate benefits for non-citizens and denaturalize migrants “who undermine domestic tranquility.”

“Only REVERSE MIGRATION can fully cure this situation,” Trump wrote, calling for a broad reduction in what he described as illegal and disruptive populations in the U.S.

As reported in Reuters, the attacker, identified as 29-year-old Rahmanullah Lakanwal, entered the U.S. in 2021 under a resettlement program established by the Biden administration following the U.S. withdrawal from Afghanistan. Although Lakanwal had legal status, Trump characterized the incident as proof of failures in immigration oversight.

In response, U.S. Citizenship and Immigration Services has indefinitely halted processing of all immigration requests relating to Afghan nationals, and Trump reportedly ordered a review of asylum cases and Green Cards issued under Biden to citizens of 19 countries.

White House officials and USCIS did not immediately comment on the proposed measures. Analysts say the shooting could have wide-reaching political implications, bolstering Trump’s long-standing focus on both legal and illegal immigration and setting the stage for intensified debate over the country’s immigration policies.