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Variant. he didn't offer specifics beyond that. he added he will have more accurate and detailed information about the efficacy of the vaccine in coming days. in the u.s. the school board is expanding surveillance at four major airports to key an eye out for omicron, and cnn has learned that the biden administration is requiring stricter covid testing for everyone headed to the u.s. so talk about these new restrictions. >> reporter: i think at a moment where there's peak uncertainty with public health officials in terms of what omicron will bring to the united states, some assumptions that i...

Eye out for omicron, and cnn has learned that the biden administration is requiring stricter covid testing for everyone headed to the u.s. so talk about these new restrictions. >> reporter: i think at a moment where there's peak uncertainty with public health officials in terms of what omicron will bring to the united states, some assumptions that it is already here at this point in time, is a recognition they need to constantly be evaluating in real-time what precautions they have in place and shift those if they need to. that's the case here. tightening, likely tightening the timeline for al...

Term and the longer term. one thing we've seen over 48 hours, this moment of peak uncertainty in terms of what this variant will bring to the united states and make no mistake about it, you talk to white house officials, they all acknowledge it's an inevitably that it will end up in this country is in the short-term pressing for more vaccinations, pressing for boosters. nearly 60% of the country is vaccinated, fewer than 20% have gotten a booster. that is the primary short-term focus but today when the president's covid top covid advisors held a press briefing it gave a window into just how ra...

Joining us now, national political reporter for axios, jonathan swan. good to have you on board this morning. anything going on? >> we're reaching peak uncertainty right now, aren't we? >> yesterday was crazy. i'm sure i'm not alone -- >> i mean, like what are you talking about? >> it's friday. >> the crazy meter, is it nine? >> i think there's not a zero percent chance that something happens with white house chief of staff john kelly, but i've said before i need someone's tongue to be notarized before i write that story. it's like groundhog day. yesterday was crazy. people in there widely bel...