to pressure her on this, without any detailed provisions there's still a lot out there. in terms of this being a big day, there's going to be a lot of negotiations ahead that will be difficult to figure out. >> anna palmer, i appreciate the suggestion for a question later. we will speak to you again soon. the fbi may pave the way for americans to mix and match covid-19 boosters. the agency could authorize boosters for moderna and johnson & johnson by the end of the day. the decision of mixing and matching could come by the end of the day. nbc news' miguel almaguer has more. >> reporter: the fda could authorize americans to receive a booster shot that's different from that already seen. the premise of mixing and matching covid vaccines would affect millions of americans. first confirmed by "the new york times" and nbc news, the government could not recommend