welcome to "cbs this morning saturday." the world unites, and so may the two koreas. diplomacy on display at the winter olympics opening ceremony. and now word it may have sparked a meeting between the presidents of north and south korea. >>> plus, increasing pressure for president trump's chief of staff. new reports say john kelly is willing to step down over the mishandling of a domestic abuse scandal involving a white house staffer.>>> cars pile up and so thousands of flightings aft-- flightings after massive storm system. >>> and how "black panther" has sparked conversation and crowd funding to help create a cultural milestone. >>> we begin with a look at today's "eye opener," your world in 90 seconds. >> president trump will not declassify the democratic memo. >> is the president hiding something? >> you've heard of the friday