Currently, 19 countries, including Afghanistan, Haiti, Sudan, Myanmar and Iran, are already subject to a full or partial travel ban by the administration. Nationals of countries under a full travel ban are barred from entry into the U.S. with few exceptions, while those under a partial ban also face significant restrictions.

“We will be announcing the list soon,” a DHS spokesperson told HuffPost in a statement.

According to NBC, the administration’s list could wind up encompassing about 10 additional countries, and it’s not yet clear how these are being determined. In June, NPR reported that the administration was considering adding dozens of other countries to its travel ban list due to alleged vetting problems.

Any expansion of this ban only adds to a larger crackdown on immigration that the administration has implemented since the shooting of two National Guard members last week. According to authorities, the suspected perpetrator of the shooting, which left one National Guard member dead and one in critical condition, is an Afghan national who worked alongside the CIA. He entered the country during the Biden administration as part of a resettlement program for Afghans who aided the U.S. and was granted asylum during the Trump administration earlier this year.

Trump’s revival of the travel ban in his second term has prompted significant backlash, given concerns the policy could lead to family separations and harm those trying to flee volatile situations in their home country. During his first term, Trump initially barred people from seven Muslim-majority countries from entering the U.S. and was forced to revise the policy after the original ban was struck down by the courts.