"From now on, a foreigner temporarily staying in the United States and wishing to obtain a green card must return to their homeland to apply," said USCIS representative Zach Kahler.

According to him, exceptions are possible only in "extraordinary circumstances," the Dunyo news agency reports, citing the US Citizenship and Immigration Services (USCIS).

The new rules will affect more than half of applicants and effectively abolish the practice that has been in force for decades, when foreigners could apply for permanent residence while in the United States.

The USCIS emphasized that nonimmigrant visas - including student, work and tourist visas - require temporary stay.

"Their visit should not serve as the first step in the process of obtaining a green card," the ministry said in a statement.

According to The Washington Post, the United States issues more than 1 million green cards annually, with a significant portion of applications previously submitted domestically.

Former USCIS Senior Adviser Doug Rand said that the purpose of the changes is to limit access to permanent residence permits.

"A permanent residence permit is a path to citizenship, and the administration is trying to block this path as much as possible," he said.

According to him, about 600,000 people apply for a green card every year while already in the country.

USCIS did not specify the date of entry into force of the rules and the procedure for their application to applications already submitted. Exceptions may be provided for cases of "national interest" or "economic benefit" to the United States.