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On saturday, more than any other recent day. dealing with both coronavirus infections among avecration crews and a winter storm sweeping the nation, a week of massive cancellations have complicated travel, including the return home. polo sandoval, cnn, new york. >> thanks, for that report. the white house is expected to unveil details about the rollout of 500 free at home covid tests -- rather 500 million i should say. >> cnn's kevin liptack is joining us live now. kevin, we still have a lot of questions about how exactly this plan to distribute half a billion tests is going to work. i guess...

Hospital. it is absolutely targeting those groups. i do think that there is a high risk that as a pandemic continues, all of us will end up being exposed to many of us will end up being infected. >> new questions when we are testing for omicron, what is the best test? everybody has been doing the nasal swabs. maybe on occasion you may get the deep swab, but now there is a move to, well, it infects mostly the throat. it would be better to do a throat swab or a saliva test. to your knowledge, what is the best way to test for omicron and what sort of test should people be looking for when they go...

Continuing to miss school for now the third consecutive school year. >> d.c. mayor muriel bowser said students and staff have to provide proof of a negative test. listen to what dr. james phillips had to say about these rapid tests. >> there is absolutely no way to keep omicron out of the schools. these antigen tests at home simply are not sensitive enough to keep omicron out of our schools. >> so do you think testing for students is an effective solution, especially if the omicron variant seems to be es escaping accuracy on those tests? >> first of all, we know there are no perfect solutions....

Tests was a consideration. jeremy diamond is with the president in delaware. what are you learning about the debate inside the white house over testing. that is interesting. >> reporter: no doubt about it, jim. listen, we heard today dr. fauci and dr. walensky adamantly saying the shortage did not factor into the change. but a senior administration official say it did factor into a decision around the guidance around the quarantine. quarantine is what the cdc -- is the term they use to refer to people who are close contact, particularly those unvaccinated. they short under that time to five da...

Who had covid-19. the cdc didn't add that criteria, and i think, frankly, they didn't add that criteria because there simply weren't enough tests to allow people to do that. hopefully that's starting to change. we need to use the tests in the proper way. >> do you think that we're relying too much on the pcr tests and we should focus more on the rapid at-home antigen tests? >> they each have their use. the antigen tests are great to tell you when you're sort of done, when you can leave isolation. that's identity deal use for them. the pcr tests are great to detect early, before the antigen tes...