President Biden says there's no need to panic, but the new COVID-19 Omicron variant is raising concern.
Speaking at the White House, Biden said his administration is moving quickly to curb its spread and warned it will emerge in the U.S. sooner or later.
The U.S. has already announced travel restrictions from multiple countries in southern Africa.
Biden urged Americans to get vaccinated and promoted boosters.
Biden vowed to "fight and defeat" the new variant while insisting full vaccination is the best defense against COVID.