The administration of United States President Donald Trump has paused all immigration applications from 19 countries it labels “high-risk,” marking the latest escalation in its hardline approach to immigration.

The directive, issued Tuesday, follows last week’s shooting of two National Guard troops in Washington by a suspect identified as an Afghan national. According to a policy memo posted on the U.S. Citizenship and Immigration Services (USCIS) website, the suspension affects green card applications, citizenship processing, and other immigration benefits sought by nationals of the listed countries—most of whom were already subject to partial or full travel bans since June.

All 19 countries are non-European and include Afghanistan, Somalia, Myanmar, Haiti, Iran, Yemen, Cuba, Laos, Turkmenistan, and Venezuela. The African nations affected are Chad, the Republic of Congo, Equatorial Guinea, Eritrea, Libya, Sudan, Burundi, Sierra Leone, and Togo.

In recent days, Trump has intensified criticism of Somali immigrants in particular, calling them “garbage” and declaring, “we don’t want them in our country.”

Under the new directive, all pending applications from affected nationals have been frozen. USCIS said individuals must undergo a “thorough re-review process” to assess any potential national security or public safety concerns. The policy applies to “all aliens from high-risk countries of concern who entered the United States on or after January 20, 2021.”

USCIS said it will, within 90 days, compile a priority list of cases for review and possible referral to immigration enforcement or other law-enforcement bodies.

The announcement adds to a string of restrictive measures introduced since last week’s shooting. USCIS recently paused all asylum decisions, while the State Department halted visa processing for Afghans who assisted U.S. forces during the war. Days earlier, USCIS had disclosed plans to re-examine refugee cases approved under the Biden administration.