Earlier this month, Customs and Border Protection officers at New York's Kennedy, Newark Liberty, Washington's Dulles, Chicago's O'Hare and Hartsfield-Jackson Atlanta airports started screening people arriving from West Africa.
The screening includes using no-touch thermometers to determine if travelers have a temperature, one symptom of a possible Ebola infection.
The Centers for Disease Control and Prevention is also working with DHS on the screening.
Homeland Security Secretary Jeh Johnson said today that now everyone traveling from Liberia, Sierra Leone or Guinea will have to land in the US at one of the five airports and then fly on to their destination.
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The new requirement means that people traveling from the region who were not originally passing through one of those five airports will have to rebook their flights.
Concerns about travelers infected with Ebola have risen since a Liberian man traveled from the region to Dallas last month.
Thomas Eric Duncan became the first person in the United States diagnosed with Ebola, a few days after arriving from West Africa. He died on Oct 8.
Since then, two nurses who helped care for him have also been diagnosed with Ebola.
Today, House Judiciary Committee Chairman Bob Goodlatte, a Republican, praised the expansion of airport screening but again urged Obama to halt all travel from the region.
"President Obama has a real solution at his disposal under current law and can use it at any time to temporarily ban foreign nationals from entering the United States from Ebola-ravaged countries," Goodlatte said.