WASHINGTON — President Donald Trump called for “reverse migration” in the United States as he outlined a further crackdown on immigration following the shooting of two National Guard members in Washington.

In a pair of Truth Social posts late Thursday that disparaged many U.S. immigrants, Trump said he would halt admissions from unspecified developing nations and revoke citizenship from some naturalized migrants. He also said he would end all federal benefits for noncitizens.

Trump offered no details on how he would implement these policies or what he considers a “third world” country, an ill-defined and often offensive term for developing nations. Congress for years has failed to pass major immigration reforms, and courts have blocked some of his previous executive orders limiting immigration.

Earlier in the day, the president had announced the death of one of the guardsmen, U.S. Army Spc. Sarah Beckstrom, 20. The attack by an Afghan national on the eve of Thanksgiving holiday has led Trump to amplify his anti-immigration policies.

Trump said he would “permanently pause migration from all Third World Countries” and “denaturalize migrants who undermine domestic tranquility.” He added that he would terminate millions of admissions under his predecessor Joe Biden and “remove anyone who is not a net asset to the United States, or is incapable of loving our Country.”

After the shooting, the White House halted Afghan immigration proceedings and ordered a review of those already in the U.S. The administration had already planned to review the cases of all refugees resettled under Biden and freeze their green card applications, according to a memo reviewed by Bloomberg this month.

The U.S. has admitted more than 190,000 Afghans since the 2021 fall of Kabul to the Taliban, mostly those who assisted U.S. forces and their families during the war.

On Thursday, Joseph Edlow, the head of U.S. Citizenship and Immigration Services, said in a social media post that his agency — under Trump’s orders — is conducting “a full scale, rigorous reexamination of every Green Card for every alien from every country of concern.”

The White House in June announced a ban on immigration from 12 countries, including Afghanistan, Haiti, Somalia and Sudan, and restrictions on seven others. In his first term, Trump barred travelers from Cuba, Iran, Libya, North Korea, Somalia, Sudan, Syria, Venezuela and Yemen.

Trump has also pursued aggressive immigration enforcement, deploying teams to cities over the objections of local officials and amid claims that authorities are wrongfully deporting migrants in violation of court orders and other legal protections.

The administration has sharply reduced the refugee admissions cap, ended temporary protected status for migrants from several countries, imposed a $100,000 application fee for H-1B visas used by tech companies and universities, and revoked thousands of visas. It is also challenging the constitutional right to birthright citizenship under the 14th Amendment.

Upon returning to office in January, Trump signed an executive order halting all refugee admissions, which was promptly challenged in court. An appeals court allowed new admissions to be paused as the litigation continues, but ordered the government to provide services to refugees who already had arrived.

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