again trying to understand the virus -- and how we prevent it from the future. >> still lots of unanswered questions, that need the answer. as we need them soon. secretary esper, thank you for joining us. >> thanks, wolf. >> also tonight, extraordinary revelations by the head of the cia, saying that china is now having doubts about invading taiwan. plus, speaking to -- against providing lethal arms to the russians in ukraine. and actor and activists sean penn is here, fresh off his latest trip to ukraine. and he's warning president biden that the u.s. will have quote, blood on our hands. if we doesn't send modern fighter jets to ukraine. stay with us, you're in the situation room. as long as you can make an impact, why stop?