supreme court hears arguments on the constitutionality of a mississippi state law that bans abortions after the first 15 weeks of pregnancy. a lot of developments we're following this morning. let's begin at the white house with the administration's plans to respond to the omicron variant. and, jeremy, discussion of testing here for international travels, a proposal as well for possible quarantine? where do things stand? >> reporter: there is a number of things under consideration now. the biden administration is considering requiring american citizens and foreign travelers flying to the u.s. to test for coronavirus one day before their trip. currently fully vaccinated travelers only need to test within three days of their trip. so this would shorten that timeline. they are also considering requiring testing upon returning home. a cdc spokesman last night confirmed that they are indeed looking at shortening that testing window, saying in a