The United States will resume admissions for refugees from 11 countries identified as presenting a high security risk, but with extra vetting for these mostly Middle Eastern and African nations, senior US officials said on Monday.

The changes came after a 90-day review of refugee admissions from Egypt, Iran, Iraq, Libya, Mali, North Korea, Somalia, South Sudan, Sudan, Syria and Yemen by the State Department, Department of Homeland Security and intelligence agencies.

The new rules are the latest changes to the US refugee program made by the administration of President Donald Trump to address what it sees as national security issues.Some of the administration's actions, including an executive order to temporarily ban all refugees, have sparked lengthy court battles.

The changes announced on Monday include additional screening for certain people from the 11 countries, and a periodic review of a list of countries identified as presenting higher security risks.

The new guidelines were announced at a press briefing by senior administration officials, who spoke on condition of anonymity. They offered no details about which people from the 11 countries will be subject to the extra screening, citing security concerns.