President Donald Trump said on Thursday he would suspend migration from what he called "third world countries," a day after an Afghan national allegedly shot two National Guard soldiers in Washington, killing one.
His social media post, which also threatened to reverse "millions" of admissions granted under his predecessor Joe Biden, marked a new escalation in the anti-migration stance of a second term that has been marked by Trump's large-scale deportation policies.
Trump said earlier that Sarah Beckstrom, a 20-year-old West Virginia National Guard member deployed in Washington as part of his crackdown on crime, had died from her wounds.
The FBI has launched an international terror investigation as new details emerged about the alleged gunman, a 29-year-old Afghan national who was a member of the "Zero Units" – a CIA-backed counterterrorism group, according to multiple US media reports.
The shooting on Wednesday, which officials described as an "ambush-style" attack, has brought together three politically sensitive issues: Trump's deployment of the military at home, which has drawn criticism from some lawmakers, immigration, and the legacy of the US war in Afghanistan.
"I will permanently pause migration from all Third World Countries to allow the U.S. system to fully recover," Trump wrote on social media.
He also threatened to reverse "millions" of admissions granted under Biden, and to "remove anyone who is not a net asset to the United States."
"I want to express the anguish and the horror of our entire nation at the terrorist attack yesterday in our nation's capital," the Republican leader said in a Thanksgiving video call with U.S. troops.
He linked the shooting and his decision to send hundreds of National Guard troops to the city.
"If they weren't effective, you probably wouldn't have had this done," Trump said. "Maybe this man was upset because he couldn't practice crime."
Joseph Edlow, Trump's director of U.S. Citizenship and Immigration Services, said on Thursday he had ordered a "full scale, rigorous reexamination of every Green Card for every alien from every country of concern."
His agency later pointed to a list of 19 countries – including Afghanistan, Cuba, Haiti, Iran, and Myanmar – facing US travel restrictions under a previous order from Trump in June.
The Trump administration had earlier ordered an immediate halt to the processing of immigration applications from Afghanistan.
The other soldier wounded in Wednesday's attack, 24-year-old Andrew Wolfe, was "fighting for his life," Trump said. The suspected shooter was also in a serious condition.
The U.S. attorney for Washington D.C., Jeanine Pirro, said the suspected assailant – identified as Rahmanullah Lakamal – had been living in the western state of Washington and had driven across the country to the capital.
In what she called a "brazen and targeted" attack, Pirro said the gunman opened fire with a .357 Smith and Wesson revolver on a group of guardsmen on patrol just a few blocks from the White House.
The suspect was charged with three counts of assault with intent to kill, charges that Pirro had already said would be immediately upgraded to first-degree murder should either of the wounded troops die.
Officials said they still had no clear understanding of the motive behind the shooting.
CIA director John Ratcliffe said the suspect had been part of a CIA-backed "partner force" fighting the Taliban in Afghanistan, and had been brought to the United States as part of a program to evacuate Afghans who had worked with the agency.
The heads of the FBI, CIA and Homeland Security and other senior Trump appointees all insisted that Lakamal had been granted unvetted access to the United States because of lax asylum policies in the wake of the chaotic final US withdrawal from Afghanistan under former president Biden.
However, AfghanEvac, a group that helped resettle Afghans in the United States after the military withdrawal, said they had undergone "some of the most extensive security vetting" of any migrants.
The group noted Lakamal had been granted asylum in April 2025, under the Trump administration, and would be eligible to request permanent residency a year later.
"This individual's isolated and violent act should not be used as an excuse to define or diminish an entire community," its president, Shawn VanDiver, said.
Pentagon chief Pete Hegseth said in the wake of Wednesday's shooting that 500 more troops would deploy to Washington, bringing the total to 2,500.
Trump has deployed troops to several cities, all run by Democrats, including Washington, Los Angeles and Memphis. The move has prompted multiple lawsuits and claims from critics that the White House exceeded its authority.