US beefs up security on refugee arrivals

New "security upgrades" to the US refugee admissions program will help block criminals and other suspicious persons from entering the United States from high-risk nations, the head of the US Department of Homeland Security says.

US Homeland Security Secretary Kirstjen Nielsen, speaking at a public event in Washington, did not give further details and said the upgrades would be announced on Monday.

The new measures would protect the refugee program from "being exploited by terrorists, criminals and fraudsters," she said. "These changes will not only improve security but importantly they will help us better assess legitimate refugees fleeing persecution."

Since taking office last year, President Donald Trump has slashed the number of refugees allowed into the country and paused the refugee program for four months. He has also instituted stricter vetting requirements and quit negotiations on a voluntary pact to deal with global migration.

State Department data show that the number of people admitted to the United States as refugees has plummeted under the Trump administration's new restrictions.