we can pursue. that doesn't require china's consent. that can lead us to the proper conclusion. >> i want to make sure that we're readying ourself for the next pandemic if -- the more that we learn from natural origins, or lab leaks, then the better off we're gonna be. >> and earlier today, top house republicans sent letters to the fbi department of energy in the state department calling for details. and transcripts. the first hearing on the origins of the coronavirus pandemic will be held on march 8th. wolf. >> pamela, standby. we'll get back to you shortly. china's been defiant from the very beginning about covid's origin. and now says i'm quoting, parties concerned should stop smearing the country. cnn's david culver is with us. he's here in washington. he was in wuhan january 2020, we the first covid cases were detected. so, what else dave it is china saying about this lab leak theory? >> the reality, is this is one of the most sensitive topics, wolf, for the chinese. you look at a range of things