President Joe Biden is expected to announce the change later today (December 2).
This will apply to all travelers, including US citizens, regardless of vaccination status.
Previously, tests could be taken within 72 hours of travel for vaccinated travelers, while unvaccinated travelers still had to take one within 24 hours of departure.
In general, U.S. borders are only open to vaccinated travelers, but unvaccinated people can enter under certain conditions, such as if they are allergic to vaccines.
Those under 18 are currently exempt from vaccination requirements, but must take a test if they are over two years old.
A government source also said the Biden administration will expand mask wear on all trains, planes and other public transportation and at airports and transit stations until mid-March.
The first case of Omicron in the United States was confirmed yesterday, and today’s announcement is also expected to outline a broader set of measures to curb the spread of Covid.
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