setup. bring in admiral brett giroir. it has been a while. welcome back and good morning to you. >> good to be here, thank you. >> bill: excellent. you believe this was a lab leak. why? >> i do. and i really became convinced of that with the w.h.o. report in march that showed definitively there was no environmental source or intermediary host. nothing linking this to any virus in the natural world. but on the other side, the evidence was becoming compelling. there is a laboratory within five miles of the origin that was doing dangerous research on bat coronaviruss. sometimes the most simple explanation is that. we do have lab leaks. that happen multiple times. sars leaked out of a laboratory and caused secretary deaths. we know in 1979 anthrax leaked out of a soviet laboratory and killed 60 people.